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Corsa Xtreme 3 in. Cat-Back Exhaust w/ Polished Quad Tips (15-17 GT Premium Fastback; 18-20 GT Fastback w/o Active Exhaust)

Item 390910
Market Price $1,849.81 You Save 12% ($212.82)
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      Review & Installation Video

      Product Information

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


      • Corsa Xtreme Cat-Back
      • Deep Aggressive Sound without the Drone
      • Straight-Through Xtreme Mufflers Featuring Corsa's Patented RSC Technology
      • Double Helix X-Pipe Included
      • 304 Stainless Steel Construction
      • 3" Mandrel-Bent Tubing w/ 2.5" Step-Down Flanges
      • Mirror Polished, Twin 4" Pro-Series Tips
      • Proudly Designed, Engineered and Manufactured in the USA
      • Fits 2015-2017 Premium Package GT Fastback Mustangs equipped with a Roush Rear Valance
      • Fits 2018-2020 GT Fastback Mustangs without the Active Valve Exhaust System


      Xtreme Aggressive Sound. If you want your GT Mustang to strike terror in the hearts of others as you blast down the road, you need to upgrade to a Corsa Performance Xtreme Cat-Back Exhaust System. Acoustically engineered and tuned, this Corsa Xtreme Cat-Back will give your coyote powered Mustang a throaty, aggressive sound under acceleration and a deep growl at idle, all without any annoying drone while cruising. This Xtreme exhaust is for those Mustang owners who don't mind disturbing the peace. As an added bonus a Corsa Xtreme Cat-Back will also improve your Mustang's exhaust flow by 43% for an increase of 5 RWHP and 4 RWTQ.

      Race Car Growl. Corsa Performance Xtreme Cat-Back Systems feature a very unique double helix X-Pipe that replaces the factory resonator Mid Pipe. The double helix "X" crossover design not only helps improve exhaust flow for an increase in power, but it also adds a crisp raspy, race car growl to the sound of your Mustang's exhaust.

      RSC™ Technology. Corsa Performance engineers all their mufflers using their very own patented Reflective Sound Cancellation® Technology (RSC™). RSC™ Technology is designed to give your Mustang's exhaust an aggressive sound under acceleration and a drone-free experience while cruising.

      Quality Construction. Corsa Performance proudly manufactures their Cat-Back Exhaust systems right here in the good ole USA. This Corsa Cat-Back is mandrel-bent from 3" diameter, premium grade, 304 stainless steel tubing for excellent exhaust flow and enduring corrosion resistance. The system includes a double helix X-Pipe and two high flow, straight-through Xtreme mufflers. The mufflers feature a pair of mirror polished twin 4" Pro-Series tips. Step down flanges are included, so that this 3" Corsa Axle-Back can be installed with the factory 2.5" exhaust.

      Application. This Corsa Xtreme Cat-Back Exhaust System with Polished Quad Tips is designed to fit 2015-2017 Fastback GT Mustangs equipped with the factory Premium Chassis Package (Trim Levels: 400A/401A) and the 2018-2020 Fastback GT Mustangs that is not equipped with the Active Exhaust System.

      Application Note. The 2015-2017 Model Years will require the use of the Roush Rear Valance 421894 or 421919 for proper installation (valance sold separately). Does not fit convertible models.

      Fitment: 2015 2016 2017 2018 2019 2020 Details

      MPN# 14335

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (37)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 37 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • August 25, 2019

        5 2016 GT - DrakeP Installation Time: Full Day


        I was in search of a quad tip exhaust that gave me no drone and lots of noise when I get on the gas. The Corsa Extreme was my final choice. I haven't had so much fun driving this car since I drove it on the first day I had it. The pros: it comes with everything needed for the exhaust side of things, and melts faces when I get on the gas with no drone on the highway. The cons: To install a quad tip exhaust, I had to use the Roush rear valence which was an incredibly difficult install. If you are looking to go for the quad tips, plan on spending a day getting this done. I felt it was worth it, there isn't many 2016 Mustang GT's riding around with 4 pipes! Overall very satisfied with the results.

        Helpful (0)
      • July 13, 2019

        5 2018 GT - Markell Installation Time: Shop Install Installation Cost: $100-$250

        2018 mustang gt

        This exhaust system is extremely loud and gave my mustang better performance

        Helpful (0)
      • June 20, 2019

        5 2019 GT - Mustang11 Installation Time: Less than 1 Hour

        Like a mustang should sound.

        Exhaust is awesome gives off that load rumble when it’s started. But not to obnoxious while driving on the highway unless you punch it.

        Helpful (0)
      • June 01, 2019

        5 2019 GT - K95 Installation Time: Less than 1 Hour

        Corsa extreme cat-back

        Came faster then expected and looks and sounds amazing. Pull the trigger and buy it already!

        Helpful (0)
      • May 16, 2019

        5 2019 GT - txkras Installation Time: Less than 1 Hour

        corsa exhaust

        looks good, sounds even better, fitment took a while to get right, but once it was finished, it looks awesome!

        Helpful (0)
      • May 04, 2019

        4 2019 GT - DeandreJ Installation Time: Less than 1 Hour

        Great purchase

        This is a very nice high quality exhaust. If you’re looking for something very loud in high rpm this is what you need. Very exotic sound when you lay on the throttle. Cruising on the highway system sounds very quite with no drone what so ever. Only issue with this product i had was the alignment of the tips. Both sides touches trim. If you have the same issue I recommend getting looked at and fixed properly to avoid melting trim.

        Helpful (0)
      • March 19, 2019

        5 2018 GT - matt75 Installation Time: Afternoon


        I went with corsa extreme on my 2018 Mustang LOVE IT sounds great. Easy install

        Helpful (0)
      • February 25, 2019

        5 2018 GT - MichaelG

        Extremely Loud and Aggressive Tone

        If your looking for something really really loud than this exhaust is for you. baby and high revs sound amazing. No drone with windows up and cruising on the freeway you can barley tell its there. You step on it slightly or open it up fully, it will for sure turn heads at low and high speeds.

        Helpful (3)
      • January 15, 2019

        4 2018 GT - Dominic


        Awesome. No complaints. Besides from the neighbors

        Helpful (3)
      • January 02, 2019

        5 2018 GT - HarleyF Installation Time: Less than 1 Hour

        Ez install. Amazing sound!!

        I honestly think it took longer to get the car jacked up and the old exhaust off them it did to install the Corsa Extreme cat back. Everything fit perfectly. Detailed instructions. Very happy with the outcome and quality. And wow!!! The Corsa extreme sounds amazing!!!!!!

        Helpful (2)

      Questions & Answers (12 answers)

      5 Top Rated Questions

      The production description says that for 2015-2017 models, this exhaust "will require the use of the Roush Rear Valance 421894 or 421919 for proper installation." Does this hold true for the 2018 models? The 2018 Perf Package has a stock quad exhaust, so I would like to know if purchasing the Roush valance will be necessary.

      • The Roush rear valance is required for the 15-17 models due to the exhaust openings being to small from the factory. Since the 2018 comes stock with quad tip exhaust the Roush rear valance will be obsolete and the Corsa Xtreme 3 in. Cat-Back Exhaust will fit with no modifications.

      Helpful (3)

      Is this legal in california?

      • The Corsa Xtreme 3 in. Cat-Back Exhaust does not affect your Catalytic Converters, and should not affect emissions inspection. However, it is best to check with your local smog center or inspection station to be sure.

      Helpful (1)

      Will these fit with the kooks 1-7/8th inch long tube headers?

      I see it says it fits a 15-17 and 18-19 but other brands dont. What makes this one different that it fits 15-17 compared to other brands like mbrp that only fit 18-19 or only fit 15-17?

      • This exhaust will only work with the 15-17 GT Fastback models that have the premium chassis which is similar to what the 2018+ models have.

      Helpful (0)

      Will these work with Stainless Works 2 in. Long Tube Headers? If not what Long Tubes will?

      • If you are referring to the Stainless Works 2 in Long tube headers with part number # 406097, then this exhaust would work with those headers.

      Helpful (0)
      Post Your Question
      7 More Questions
      My mustang has Active Exhaust from the factory, will this fit my mustang or do I have to forcefully get the Active Exhaust version? 1 answer
      just a little quick question, does this come with the Corsa Decal? Just curious 1 answer
      I know it says that the corsa exhaust will fit a 2015 premium package, but will it fit a 2015 performance package? 0 answer
      Hi.Does it have a quiet mode?. Or its just loud all the time?. 1 answer
      Will this fit the base model for 2018 GT 1 answer
      The page says that this will fit a 2015 GT premium but will it fit a base GT if you also add the roush rear valence? 1 answer
      Will this catback system fit with the GT350 rear valance? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Twin Exhaust Tips
      • (1) Right Muffler Assembly
      • (1) Left Muffler Assembly
      • (1) X pipe assembly
      • (1) Right Over Axle Intermediate Pipe
      • (1) Left Over Axle Intermediate Pipe
      • (2) Step Down Flanges - for use with OE Size Exhaust
      • Clamps
      • Installation Hardware

      Tech Specs

      Cat-Back Exhaust Specifications
      Piping Material:304 Stainless SteelTip Material :Polished 304 Stainless Steel
      Piping Size:3" - 2.5" Step Downs IncludedTip Size:4" Twin
      Muffler Type:Straight-throughFitment:2015-2017 GT Fastback

      Will It Fit My Mustang

      • GT - 15, 16, 17, 18, 19, 20

      Compatible with Premium Package Fastback GT Mustangs equipped with required 15-17 Roush Rear Valance only.

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