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Gibson Exhaust Systems - 18603

Cat-Back Exhaust
  • $3,008.23
  • $554.95
  • Free Shipping
  • Ships Between 1/28 - 1/30
  • What Do You Drive?


  • Style:
    3" Single swept side exit (Aluminized)
  • Part #:
  • Exits Behind Passenger Side Rear Tire
  • Tubing diameter: 3.00" aluminized mandrel bent tubing
  • Muffler specifications:
    • Inlet: 2.25" dual
    • Outlet: 3.00" center
    • Body height: 4.00"
    • Body width: 9.00"
    • Body length: 18.00"
    • Body shape: Oval
    • Exhaust sound: Aggressive
  • Tip specifications:
    • Inlet: 3.00"
    • Outlet: 4.00"
    • Length: 12.00"
    • Finish: Polished
    • Material: 304 Stainless steel
    • Style: Rolled
    • Cut: Slash-cut
  • Download installation instructions (PDF)

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Gibson Exhaust Systems Part #18603 Customer Reviews

Average Rating

5 Customer Reviews


Reviewed by Joanell R (Modesto, CA) Reviewed for a 2012 Toyota Tundra — Oct 21, 2015 3:32 PM

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Overall I like this exhaust. There is a drone on my truck at 65 under normal use and a bit excessive when I'm pulling my 22' travel trailer. Over time I am getting use to it. My MPG hasn't reduced, it stayed the same. However, I did also install the AFE Magnum Force Air Intake. I was hoping for a little more torque from this setup but overall a great product for the price.

2012 toyota tundra 4.6 double cab

Reviewed by nazer d (SNYDER, TX) Reviewed for a 2012 Toyota Tundra — Jul 31, 2015 10:12 AM

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Arrive in great condition. Installed in just 45mins. The muffler sounds really good in idle and when shifting gears but starts drone at 65-80mph. I tweak and ended up cutting the tailpipe after the muffler hanger with exhaust pointing at 45 degree angle before the differential. The drone decreased about 75%. I havent seen any improvements on the mpg but on the torque its quicker than the stock. They will hear you once you stomp your foot in the gas. Gibson has a deep sounding tone

Great quality for great price

Reviewed by S (Redmond, WA) Reviewed for a 2014 Toyota Tundra — Dec 27, 2014 10:48 PM

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This system is one of the easiest to install. It has increase the low end horse power and torque. It is the best bang for the buck.

2014 Toyota tundra Gibson exhaust

Reviewed by Pedro C (COLUMBUS, GA) Reviewed for a 2014 Toyota Tundra — May 25, 2014 7:46 PM

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1 of 1 people found the following review helpful.

Great exhaust fit was real good just might need to be welded good sound not real loud tip looks real good but exhaust coat could be a little better but for price im very happy power feels alitter better can't tell on gas mpg yet.

Great exhaust

Reviewed by steven m (Chicago, IL) Reviewed for a 2010 Toyota Tundra — Jun 04, 2010 10:56 PM

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11 of 11 people found the following review helpful.

I installed the gibson exhaust on a 2010 toyota tundra crew max with the 5.7 v8. It has an excellent deep sound, and instantly gave me more power and added about 3.5mpg. not bad for just an exhaust, I highly recommend it!