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Gibson Exhaust Systems Part #615604 Customer Reviews

Average Rating

4 Customer Reviews

2008 GMC Sierra build up

Reviewed by Richard D (LAFAYETTE, LA) Reviewed for a 2008 GMC Sierra — Jul 22, 2015 10:43 AM

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I had Gibson headers & exhaust system on my 05 Ram & couldn't wait to get the money together to purchase this Gibson exhaust for my GMC Sierra! Please cut the old exhaust in half to remove easiest way. Install of Gibson was easy I did it myself on a lift. I did opt for the stainless steel version and it looks & sounds like grown man stuff! Just buy it the system you will not be disappointed. Auto Anything is AWESOME! Got it to me quick! Will be buying more items to complete my build up!

swept side exhaust

Reviewed by Tom W (GUNNISON, CO) — Oct 12, 2014 3:09 PM

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2 of 2 people found the following review helpful.

This system is of great quality. There is absolutely no drone which is awesome when pulling a load. I would recommend this exhaust to a friend


Reviewed by anton f (Mansfield, OH) Reviewed for a 2008 GMC Sierra — Oct 29, 2011 9:15 PM

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The quality of the exhaust system was excellent and the installation was easier then I expected. I was able to use the factory hangers and everything fit nicely. The sound was what Gibson said it would be a deeper throaty louder then stock . I'm very happy and would recommend Gibson exhaust systems to everybody looking for quality, installation, sound. Thanks Tony

07 silverado

Reviewed by JAMES M (El Mirage, AZ) Reviewed for a 2007 Chevy Silverado — Dec 27, 2007 10:04 AM

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8 of 11 people found the following review helpful.

nice mellow tone. no interior resonance. easy install. picked up approx 1 mpg. great product

Gibson Exhaust Systems - 615604

Cat-Back Exhaust
  • $573.80
  • Free Shipping
  • Ships Between 8/31 - 9/05
  • What Do You Drive?


  • Style:
    3" Single swept side exit (Stainless)
  • Part #:
  • Exits Behind Passenger Side Rear Tire
  • Tubing diameter: 3.00" aluminized mandrel bent tubing
  • Muffler specifications:
    • Inlet: 3.00" offset
    • Outlet: 3.00" offset
    • Body height: 8.00"
    • Body length: 24.00"
    • Body shape: Round
    • Exhaust sound: Aggressive
  • Tip specifications:
    • Inlet: 3.00"
    • Outlet: 4.00"
    • Length: 12.00"
    • Finish: Polished
    • Material: 304 Stainless steel
    • Shape: Round
    • Cut: Slash-cut
    • Attachment: Clamp-on
  • Download installation instructions (PDF)

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