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Whipple W175AX 2.9L Intercooled Supercharger Kit; Stage 1 (15-17 GT)

Item 384438
Market Price $8,899.99 You Save 17% ($1,504.00)
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      Review & Installation Video

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Increase Rear Wheel Horsepower and Torque
      • W175ax 2.9L Twin Screw Whipple Supercharger - Complete Kit
      • 6-Rib Belt System with Adjustable Idler System
      • Air-To-Water Intercooler
      • Self-Contained Oversized Oiling System
      • Fits Under Stock Factory Hood
      • Re-Uses Factory Throttle Body
      • 50-State Emissions Legal - Carb EO Number D-231-45
      • Choice of 6 Finishes
      • Fits 2015-2017 GT Mustangs


      Even More Power! The stock 2015-2017 GT Mustangs come with an awesome 435 Horsepower and 400 lb/ft of Torque from the factory, but after installing a Whipple Stage 1 Supercharger on your Pony, you'll be planting about 750 Horsepower and 620 lb/ft of Torque at the flywheel.

      Kit Contents. Opt for this 50-State Legal Supercharger System if you are hunting for the best power and performance out there for your S550. Complete with an an enormous air-to-water intercooler, PCM programming and installation hardware, this Twin Screw Whipple SC will deliver top of the line power for your Pony.

      Choice of 6 Finishes. This Whipple Stage 1 Supercharger not only improves horsepower and torque, but also improves your Mustang's under hood appearance. It is available in your choice of six finishes, including Polished, White, Blue, Black, Red and Gold. Please choose your color from the ordering options above.

      CARB Certified. This Whipple Supercharger is 50-State emissions-legal - CARB E.O. #D-231-45.

      Application. This Whipple W175AX 2.9L Twin Screw Stage 1 Supercharger Kit is specifically designed for use on the 2015-2017 GT Mustangs that are equipped with the 5.0L 4V Coyote engine.

      Technical Note. This Whipple Supercharger will re-use the factory throttle body.

      Please Note: Whipple Supercharger Kits are built to order for our customers. Because of this, there can be a 10 to 14 day lead time on orders.

      Fitment: 2015 2016 2017 Details

      MPN# WK-2620B-POL-STG2






      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (10)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 10 customers

      Installation Time: Weekend

      Installation Cost: $1000+

      • August 23, 2017

        5 2017 GT - snipecity10 Installation Time: Weekend

        Tire shredding monster!!!

        Took a weekend to install and let me tell you it completely transforms this car. The ability to just bolt on this much power is crazy. This thing with only 10lbs of boost screams which is worth the money all by itself. Make sure you put beefy tires on your car because I spin my 305 Mickey thompsons all the way through 3rd gear. Be safe and have fun everyone

        Helpful (33)
      • June 14, 2017

        5 2017 GT - Mike Installation Time: Shop Install Installation Cost: $1000+

        Whipple power

        I ordered the Supercharger at the end of March and it showed up May 19th. I just had it installed along with kooks long tube off road headers and carbon fiber driveshaft. I already had the corsa extreme which was already loud. This thing sounds and performs like a race car. It is quick. Install took 4 days since whipple forgot to add bolts to the kit. We had to call and let them know but they overnighted them the next day. The instructions were amazingly easy to understand. If I had looked at them before telling my mechanic to do the install, I may have tried to do it myself.

        Helpful (27)
      • April 21, 2017

        5 2016 GT - CraigK Installation Time: Weekend

        Whipple W175AX 2.9L Review

        The Whipple W175AX 2.9L kit for the 2015-2016 Mustang GT is a very comprehensive supercharger system, and has everything except the coolant needed for the SC/intercooler system itself. I installed the 2.9L in January 2017 into a 2016 GT PP with manual transmission, and opted for the Stage 1 kit that utilizes the factory 85mm throttle body. I am very particular about installation quality and precision, and took over a week to install, spending a couple hours during the weekday evenings and 6-8 hours each day on the weekend, so maybe 24 hours or so. The process was delayed a few days after I started because a couple heater hoses supplied by Whipple were incorrect. Whipple was extremely responsive in supplying the correct part(s). I’ve been wrenching for a long time, so there was nothing in the install that was very difficult, but if you’re a novice make sure and read the install guide front to back before starting. The 2.9L gives the 5.0L Coyote phenomenal power, even with the stock throttle body. I live at 7200’ elevation, so my power output is probably down 20 from those at sea level. The car is scary fast and I worry about eventual driveline issues with this much power (clutch, UJs, half-shafts), as well as possible problems with engine internals. I haven’t read any contemporary literature about reduced lifespan of any of those components, maybe since this is a fairly new SC for the Coyote platform. **INSTALL NOTES** As for the installation itself, initial disassembly was fairly time consuming (removing the front bumper cover and belly pan, engine intake and cooling hose disassembly). Install instructions were very accurate except for a few minor errors. Whipple is very good at updating/correcting the install guide and supplying the most recently updated version. During the install I noticed several things of interest: (1) The heat exchanger supply line from the reservoir was too short, and had to splice a 3” piece to complete. (2) I had to add a 90-degree elbow into the SC intercooler supply line (from the heat exchanger) to accommodate the swing needed by the tensioner to avoid interference with the supply line (I actually noticed nicks in the supply line caused by tensioner interference). (3) The fuel rails (once torqued to specs) interfere too greatly with the remaining center SC bolts making it very difficult to get an accurate torque on those. I ended up changing the torque sequence slightly to accommodate, torqueing the fuel rails last. (4) Check the orientation of the thermostat carefully upon reinstallation, the install guide shows it in the correct position, but your perspective is different when installing it in an inverted position. (5) Be very cognizant of wiring harnesses/connectors and heater hoses near the idler plate. If not zip-tied correctly they can come in contact with the SC drive belt. (6) Very small amounts of lithium grease help immensely in the install of injectors, intake components, and hoses. After install and initial shakedown runs, I had a belt misalignment problem which actually caused a belt breakage. Whipple was very responsive and sent out new idler plate offsets (stands) that were originally manufactured incorrectly, causing a misaligned idler plate (hence misaligned pulleys), resulting in belt slippage, throws, and breakage. Correctly-sized offsets are most certainly supplied with current releases of the 2.9L SC. I also notice a slight hesitation upon acceleration in the 2000-3000 RPM range. I attribute this to the 7200’ elevation and will take the car to a lower elevation to confirm. If the problem persists I will either get another tune (non-Whipple) or add the Stage 2 intake (132mm oval) with a new tune from Whipple. Overall, although there were a few minor challenges, the install went well and the SC seems bulletproof now. It whines noticeably under heavy acceleration (although still too quietly), mainly because of the twin screw design. Good job, Whipple!

        Helpful (53)
      • April 08, 2017

        5 2015 GT - JamesF Installation Time: Weekend


        My only complaint is that it Did not come with the throttle body pictured in the ad. Still worth every penny. Car only has 8,000 miles on it and kept debating if it was worth a void Warrenty and $7500. If I had to buy anther car today I would order it when I got home.

        Helpful (21)
      • March 07, 2017

        5 2016 GT - OceanCowboy Installation Time: Shop Install

        You're gonna need wider tires!

        Beautifully designed and build. Really puts out the power, hang on for the ride!

        Helpful (14)
      • January 15, 2017

        5 2016 GT - Chrish1972 Installation Time: Weekend

        Stage 2

        I did not make my purchase through American muscle for this only because they didn't offer the stage 2 I wanted. However I still think it should have another review. I did the complete install myself. Took a day and a half. I followed all instructions to a t. What a difference this system makes. Looks great runs excellent perfect addition.

        Helpful (17)
      • January 06, 2017

        5 2015 GT - underdog Installation Time: Shop Install Installation Cost: $1000+

        Just wonderful

        Got one of the first when the car came out. Had issues at first now it's just unreal the horsepower out of a stock motor tuned by rodeheavers hotrod shop in masontown PA with over 700 HP to the tires on a mustang dyno very fast car now

        Helpful (12)
      • October 11, 2016

        5 2016 GT - Gearhead

        HOLD ON TIGHTLY!!!

        Excellent instructions, installed in a weekend. The tune was easy to download using the flare program. Outstanding Horsepower and incredible low-end Torque! The following weekend drove the car on a 5 hour trip to Cruising the Coast (20th Anniversary) in Biloxi, Mississippi. The car and blower performed flawlessly the 4 days we were there, and also during the 5 hour trip back. The driveability and power are incredible! Thank you Whipple for an OUTSTANDING blower system and OUTSTANDING tune!!! I can easily light up my 305/35 Mickey Thompsons at will far the best blower system for 2015 and up Mustangs!!! Thanks again Whipple for a quality system and American Muscle for having everything I need to increase the performance of my 2016 GT! Now the next step is the Phase 2 Whipple kit....

        Helpful (21)
      • August 13, 2016

        5 2016 GT - Overkill

        Best supercharger bar none

        I did quite a bit of research prior to purchasing this supercharger for my 2016 Mustang GT with the performance pack. I've had an 1800 horsepower Foxbody Mustang prior to this so I'm not a stranger to race cars or high horsepower. I've also done a tremendous amount of modifications to numerous cars and I've never had a kit with this level of fit, finish and quality. The instructions are very good. They are not perfect because there have been running changes to the cars and even to their kit, however most mechanically inclined people will be able to figure out the minor changes and difference between the written instructions and what you need to do. The Flare prigramming SW and ECU tune that comes with the Whipple supercharger kit is really top-notch. I'm sure there are 'tuners' out there that may squeak a little bit more horsepower out of the motor however I feel confident that having a Ford engineer behind this tune up ensures both reliability and emissions compliance (50 state legal). The drive ability is outstanding and even the driving mode switch still works as it should whereas some aftermarket tunes lose that functionality. I grin from ear-to-ear every time I drive this car now.

        Helpful (26)
      • June 17, 2016

        5 2015 GT - J Installation Time: Weekend


        Coyote on steroids. ridiculous power. Be safe. Have fun!

        Helpful (12)

      Questions & Answers (73 answers)

      5 Top Rated Questions

      If you install this supercharger on a bone stock 2015-2017 mustang GT, would you need to do anything with the fuel system or would the factory system handle this without problems? Obviously this kit comes with injectors, I'm just wondering if anything else is reqd

      • The Whipple W175AX 2.9L Twin Screw Supercharger Kit comes with everything included for your GT and will not cause any problems. You can upgrade your injectors, fuel rails, fuel lines and fuel pump if you decide to run a specific set-up or different fuel.

      Helpful (10)

      Will I have to modify the block of my '17 GT to install this supercharger?

      • The Whipple W175AX 2.9L Twin Screw Supercharger Kit should not require modification to the factory block.

      Helpful (8)

      Does this system require modifying the block the same way that the roush and ford performance supercharger do? Also I would be retaining stock clutch for now until further down the road. Not planning on racing just want it for the extra power.

      • The Whipple W175AX 2.9L Twin Screw Supercharger Kit will not require block modifications. An upgraded clutch is strongly recommended, as the stock clutch will not be able to handle the increased power for very long.

      Helpful (6)

      Why is it saying the stage 1 putting out more horsepower than the stage 2?

      • The Whipple W175AX 2.9L Intercooled Stage 1 Supercharger Kit is rated to make up to 750 Horsepower and 620 lb/ft of Torque at the flywheel. The Whipple W175AX 2.9L Intercooled Stage 2 Supercharger Kit is rated at up to 825 Horsepower and 640 lb/ft of Torque at the flywheel.

      Helpful (5)

      When installing this supercharger, would the engine needs forged rotating assembly, or would the stock block hold up with this power?

      • No, the engine would not need to have a different forged rotating assembly. The new model 5.0 coyote engines that came in the 15-17 mustang GT's/GT350/GT350r already have forged internals, so the lower end, and the engine in general, can handle the amount of power that this supercharger would give it.

      Helpful (4)
      10 More Questions
      What is the recommendation on fuel octane with this Supercharger on a 16 GT? 1 answer
      With the stage 1 kit. No other mods or tuning. What kind of numbers will I be running? 1 answer
      Stupid question but does it come with everything for it to run? Cause it's pretty cheap so wanting to make sure it comes with everything 1 answer
      Does this system be run with 91 octane fuel? 1 answer
      Why doesn't this fit the 2018 Mustang? Do they make one for the 2018? 1 answer
      Will the strut bar on the performance package fit over it between the hood and the supercharger? 1 answer
      This kit claims to use the factory throttle body. Is there anything extra I might need to get to use the BBK 90mm Throttle Body I have? 1 answer
      Currently have a stock 2016 mustang GT looking to boost my Horsepower how much horsepower will this mod add to my car 1 answer
      Is this the new generation of superchargers that whipple recently announced? 1 answer
      Does this kit come with an intake or does the stock intake work with it? Thanks. 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • W175ax 2.9L Twin Screw Whipple SC
      • Air-to-Water Intercooler
      • Crusher Air System
      • PCM Programming
      • OBDII Flash Tool
      • Flight Control Software
      • Installation Hardware

      Tech Specs

      • W175ax 2.9L Twin Screw Whipple Supercharger Assembly
      • Finish Choices: polished, white, blue, black, red, or gold
      • 6-rib belt system with adjustable idler system
      • Air-to-Water Inter Cooler
      • Self-contained oversized oiling system
      • Plug and play wiring
      • Fits under factory hood with no modifications
      • Professional Installation Recommended

      Will It Fit My Mustang

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