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Pypes 2.5 in. Stainless Steel Replacement Flow Tube Kit (79-04 V8, V6; 94-99 Cobra)

Market Price $68.99 You Save 13% ($9.00)
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  • Item 20109
  • MPN# PFF10K

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Features, Video & Details

  • Required for Aftermarket Muffler Installs
  • Mandrel-Bent Construction
  • 2.5" 409 Stainless Steel Tubing
  • Fits 1979 to 2004 Mustangs

Review & Installation Video

Review & Install Video

Replacement Flow Tubes. Replacing the restrictive stock mufflers is a great idea, but you may end up damaging the factory flow tubes in the process. That is why we offer Pypes 2.5" Stainless Steel Replacement Flow Tube Kit. This kit will replace the piping between the Mid Pipe and the mufflers for a perfect installation.

Durable Stainless Steel Construction. Pypes uses sturdy 16 gauge 409 stainless steel mandrel bent 2.5" tubing with a ball and socket-style connector for improved flow and includes a set of two 2.5" 304 stainless steel flanges.

Application. This Pypes 2.5" Replacement Flow Tube Kit is designed for use on the 1979 to 2004 Mustangs when replacing the stock mufflers with aftermarket mufflers or resonators.

Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (2) Flow Tubes
  • (2) Brackets
Installation Info
Tech Specs
Will it fit my Mustang?
  • Bullitt - 01
  • Foxbody - 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04
  • Cobra - 94, 95, 96, 97, 98, 99
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

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Most Helpful Reviews

Flow tubes

These are a great option for the guys that don't want an out-of-the-box exhaust system. Now I have one more thing on my car that I can say I "custom built". The tubes are 16.5" and 18" long, which gives ...

Read More
Helpful (4)

94 GT

These follow tubes make life easier when dealing with mid pipe.

Helpful (2)

Overall Rating 4.7 out of 5 stars
Read All 53 Reviews

Customer Photos (9) Submit Your Photo

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9 Questions / 5 Answers

Ask a Question

Do I have to buy these if I'm buying an x pipe and flowmaster mufflers


  • Hey Vincent, You do not HAVE to buy them, they just clean up the piping of the exhaust system by replacing your stock pieces. but your x pipe and flowmasters should bolt on regardless


Helpful (0)

I was thinking of getting these and also get the SLP Loudmouth Resonators. Would I need to weld or get clamps to connect the 2?


Do these bolt on directly to the bracket after the cats?


  • The Pypes 2.5 in. Stainless Steel Replacement Flow Tube Kit will connect to the mid pipe's flanges, and then to the mufflers on the opposite end.

    Rob D

Helpful (0)

Will the m- 80 pypes mufflers slip into each end of the flow tube? That way I could just clamp them or will they not fit into each other and require welding?


  • This replacement flow tube kit will require welding.


Helpful (0)

Where can I find the bolts that go along with this piece?


  • Hello! For this Pypes 2.5 in. Stainless Steel Replacement Flow Tube Kit you could simply just measure and buy the correct length and size hardware you will need.

    Ryan H

Helpful (0)

can you use these to replace where the catalytic covers were welded on? or can i use any kind of straight pipe for that?


  • These Flow Tubes are designed for when you replace stock mufflers with aftermarket mufflers or resonators. You may be able to use these to replace the catalytic converters, but it will not be a direct bolt on because of how the tubing is bent.


Helpful (0)

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Customer Reviews (53) Write a Review

Overall Rating 4.7

out of 5 stars

  • 5/5

    January 07, 2011

    Flow tubes

    These are a great option for the guys that don't want an out-of-the-box exhaust system. Now I have one more thing on my car that I can say I "custom built". The tubes are 16.5" and 18" long, which gives you plenty of extra material to trim off if needed. What they don't tell you is that they are side specific...there is a left and a right tube.

    Brady A.

    Helpful (4)

  • 5/5

    November 23, 2016

    94 GT

    These follow tubes make life easier when dealing with mid pipe.


    Year: 1994 Submodel: GT

    Helpful (2)

  • 5/5

    December 08, 2011

    Flow tubes with m-80s

    Installed these with a set of m-80's. With an offroad X-pipe the engine sings without choking. Bolts right up to existing midpipe and fit right in to the the Pypes m-80 mufflers with some 2.5" clamps. This setup flowed so much better than the old chambered mufflers on my boosted mustang that I had to retune.


    Year: 2004 Submodel: GT

    Helpful (2)

  • 5/5

    December 07, 2011

    Good product.

    I damaged the old flow tubes while crossing a construction spot in the road and got these for replacement. These fit like they are supposed to and were a quick fix to my problem. Good product.


    Year: 2003 Submodel: GT Humble, TX

    Helpful (2)

  • 5/5

    February 26, 2017

    Great fit

    Ordered these for my upgrade to 2.5 inch exhaust and it was direct bolt on no welding used old hardware.


    Year: 1986 Submodel: Other

    Helpful (1)

  • 5/5

    February 20, 2017


    I have no complaints with this product. I would buy thsee again!!


    Year: 2001 Submodel: Bullitt

    Helpful (1)

  • 5/5

    January 28, 2017

    Best For the Best

    Great Fit, Bolded right to the mid pipe and fit in the muffler inlets Would recommend when purchasing aftermarket mufflers


    Year: 1989 Submodel: LX

    Helpful (1)

  • 5/5

    October 25, 2016

    Flow Tube Replacement

    Pipes fit fine, easy to change mufflers without replacint cat back system


    Year: 1995 Submodel: Cobra

    Helpful (1)

  • 5/5

    September 12, 2016

    Review for tail pipes

    I totally would so make the same decision again I am over pleased with the whole purchase


    Year: 1989 Submodel: Other

    Helpful (1)

  • 5/5

    June 10, 2016

    Awesome fit

    I installed a new BBK H pipe and BBK Varitune muffler and these pipes were just the thing to bridge the gap between the two units. Fit was perfect and installation took less then 30 minutes. They are a awesome quality product. Shipping was fast and everything came packaged well.


    Year: 1986 Submodel: GT

    Helpful (1)

  • 5/5

    May 17, 2016

    Great fit

    Perfect fit for install. Great purchase. I wanted a cat back but didnt want American Thunder. I wanted the original 40's. So I bought the kit on ebay plus these.


    Year: 1989 Submodel: GT

    Helpful (1)

  • 2/5

    May 02, 2016

    2000 v6 mustang

    Did true dual to my 2000 v6 mustang the bending in this fitted weird with the Mac o/r h-pipe ended up scrapping them..might work with others but didn't work for me it's good material but wasn't for me


    Year: 2000 Submodel: V6

    Helpful (1)

  • 5/5

    October 26, 2015

    pypes flow tubes

    Perfect replacement tubes! Not a complaint to be had with these.


    Year: 1997 Submodel: Cobra Summerville,S.C.

    Helpful (1)

  • 5/5

    December 09, 2011

    Pypes flow tube

    Great product! i used these on my 04 GT when i did my exhaust. They fit great and the only thing you might need to do is cut them to length but other than that the pre-bent tubing is perfect. This item is a must have if you want to keep that 2.5in flow from your x-pipe to your mufflers which is important.


    Year: 2004 Submodel: GT

    Helpful (1)

  • 5/5

    December 07, 2011

    good product

    no trimming needed for my 1985 , i did the full exhaust and needed these for it thanks am!!!!!


    Year: 1985 Submodel: GT sherwood park , AB

    Helpful (1)

  • 5/5

    September 11, 2017

    Flow tube review

    Excellent fit. Truly a bolt on install. Solid construction.


    Year: 2001 Submodel: GT

    Helpful (0)

  • 5/5

    September 09, 2017


    They worked perfectly it helped make it sound great


    Year: 1995 Submodel: GT

    Helpful (0)

  • 5/5

    August 28, 2017

    Flow tubes

    Perfect fit bolt right up. Made much easier. And if ever need to remove its simple cant ask for more then that


    Year: 2002 Submodel: GT

    Helpful (0)

  • 5/5

    August 22, 2017

    Replacement flow tube kit

    They fit perfectly on my 1987 LX mustang. Bolted on to the H pipe and had them welded to the mufflers


    Year: 1987 Submodel: LX

    Helpful (0)

  • 4/5

    August 08, 2017

    Needed as an extension

    I needed to extend my piping from my mufflers to reach my shorty mid pipe. This made the job a lot easier. Took it to the shop and they welded it on.


    Year: 2004 Submodel: V6

    Helpful (0)

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