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BBK Varitune Muffler - Aluminized 2.5 in. (79-04 All, Excludes 99-04 Cobra)

Market Price $126.49 You Save 13% ($16.50)

$109.99 (each)

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  • Item 56242
  • MPN# 3101

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Features, Video & Details

  • BBK Varitune Muffler with "Adjustable Power Valve"
  • Change from a Three to One Chamber Exhaust for More Power and Sound
  • 8-10 Decibel Range Difference
  • Offset Inlet and Outlet Design
  • 2.5" Inlet/Outlet Diameter
  • Aluminized Steel Construction
  • Sold Individually

Product Resources

Customer Reviews (4)

Review & Installation Video

Review & Install Video

Hey I’m Justin with AmericanMuscle.com and this is my brief breakdown of BBK’s Varitune muffler available for all later generation Mustangs. The Vari-tune is a fully tunable muffler allowing the owner to change his or her tone in a matter of minutes simply by adjusting the power valve here on the muffler itself. By opening and closing the valve you are essentially changing from a 3 chambered muffler and a single chambered muffler. This allows you to go from a relatively quiet exhaust setup to a loud, aggressive setup in a matter of minutes using nothing more than a simple wrench to adjust the power valve. To see how everything works BBK was nice enough to send a sample that has been cut-up to expose the inner workings of the muffler itself. As you can see with the power valve fully closed like it is now, the exhaust has to travel through all 3 chambers which is going to keep the sounds levels down considerably. However, as soon as you open up that power valve all the way, you’re essentially bypassing these first two chambers and it’s at that point the exhaust becomes much louder and you might pick up a few horsepower at the rear wheels thanks to the increased flow. If you’re not watching this vehicle currently on our site and you want to hear some sound clips of this muffler in action, just click on the link to do so. BBK does offer the exhaust in both aluminized steel and full-stainless, with a slight difference in price between the two. The exhaust does come with these 4” polished tips standard, but there are optional 4” black tip available just in case you wanted to switch up the look a little bit. If you have any questions about going with a Varitune setup for your ride, just get in touch with one of our Mustang experts, you can give them a call at 855 422 7439 or drop them an email at support@americanmuscle.com. As always you can find the Varitune and other great products from BBK right here at AmericanMuscle.com, and if you want to see my overviews on these products in addition to other great products for your ride, just subscribe to our YouTube channel by clicking the link below or up in the corner.

Adjustable Sound. BBK's patented tunable Varitune performance mufflers allow you to change from a mellow three chamber exhaust sound to a rich throaty straight-through exhaust note with just a twist of a wrench, for a 8 to 10 decibel sound level difference!

How It Works. BBK Varitune performance mufflers utilize an internal "Adjustable Power Valve." When in the closed position the valve blocks the exhaust flow, forcing it through all three chambers of the muffler for a classic mellow sound. When in the open position, the valve "uncorks" the exhaust flow, allowing it to take the path of least resistance, acting more like a straight-through muffler for a rich throaty exhaust note. This unique design is perfect for personalizing the power and sound levels of your Mustang to suit your own specific needs.

Aluminized Steel Construction. Manufactured using the highest quality heavy gauge Aluminized Steel available, BBK Performance utilizes both robotic and hand welding to ensure the quality and durability of each of their mufflers.

Application. This BBK Varitune Muffler features a 2.5" inlet and outlet diameter in an offset configuration making it the perfect muffler for 1979 to 2004 Mustangs, including the LX, V6, GT, Bullitt, Mach 1 and 1994-1998 SVT Cobra models. Excludes 1999-2004 SVT Cobras with IRS.

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
  • (1) Muffler
Installation Info
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
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

Most Helpful Reviews

1/5
Terrible exhaust!!!!!!

I'm not trying to get my money back on these mufflers because they belong in the trash, I'd rather put cats back on my car to make it quite rather than these. When I had them installed they were quite ...

Read More
Helpful (1)

1/5
Totally Disappointed.

I was so disappointed and upset after I had these mufflers installed. I removed an old pair of Flow Masters and was upset to hear that these Vari Tune BBKs were quieter even when fully opened and no growl ...

Read More
Helpful (1)

Overall Rating 2.5 out of 5 stars
Read All 4 Reviews

Customer Photos

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Customer Reviews (4) Write a Review

Overall Rating 2.5

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 3 3
  • Exhaust Note 2.75 2.8
  • Fit & Finish 4.666667 4.7
  • Bang For Your Buck 3 3



  • 1/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    September 25, 2014

    Totally Disappointed.

    I was so disappointed and upset after I had these mufflers installed. I removed an old pair of Flow Masters and was upset to hear that these Vari Tune BBKs were quieter even when fully opened and no growl as shown on the website. I do not recommend these muffler at all. I almost want to eat the cost and have them replaced!!!!

    Stangz46

    Year: 1998 Submodel: GT Chicago, IL, USA

    Helpful (1) (0)

  • 1/5

    Installation Time: Less than 1 Hour

    March 27, 2014

    Terrible exhaust!!!!!!

    I'm not trying to get my money back on these mufflers because they belong in the trash, I'd rather put cats back on my car to make it quite rather than these. When I had them installed they were quite and after they broke in, it had a deeper mellow sound that was nice. But the bolt to the muffler came off even after I tightened it down, and every time I push on the gas I get a very annoying high pitched noise coming from the muffler. I have put new nuts to make it stop the noise and it wont. I will be throwing these out and getting new ones!

    Trevflorida

    Year: 2002 Submodel: GT Orlando, FL, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    December 20, 2013

    Pretty cool

    If you want to a good sounding mustang with extra horsepower I would definitely recommend this

    Davesaleen

    Year: 2001 Submodel: GT California

    Helpful (1) (1)

  • 3/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    February 06, 2014

    BBK Vari-tune Muffler(s)

    Kinda disappointed in the sound quality. Replaced 44's, not much difference. At 4,000 RPM, there is a slight difference in tone, not enough to say "YES!"

    JoeMe396

    Year: 1996 Submodel: GT Carmel, CA

    Helpful (1) (2)

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