Not sure which 2004 GMC Sierra Performance Exhaust Systems are right for you? We have over 7601 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"This exaust is really nice. The deep throaty noise is awsome, and it looks good too." —Kevin N from Madison, IN bought a Magnaflow Exhaust Systems for a 2004 GMC Sierra, 1500, crew cab, 5' 6" short bed, 5.3L V8.
"Installation was a breeze,with the help of MR.SAWSALL. Just over an hour for complete install. And on to great performance and sound. Also great looks with the free TIP! Thanks Autoanything Rick" —Rick O from Henderson, NV bought a MBRP Exhaust Systems for a 2004 GMC Sierra, 6.6L Duramax.
"Everything was great with one exception, the muffler came pre-dented. It wasn't due to shipping. Install was quick and simple, did it without any help on the garage floor. The tips are longer than what is shown in the photo and actually look better. They might consider an additional model or a tighter final bend to put the tips just behind the rear wheels. That would allow the mud flaps to catch most of the splash back. They sound pretty good all around. I chose the side exits because it seems whenever you see a truck with rear exits they are bent or crushed or missing a hanger. A truck is a truck and susceptible rear end damage so something to consider if you undecided about rear or side exits." —Larry L from Greenwood Village, CO bought a Borla Exhaust Systems for a 2004 GMC Sierra, 1500, extended cab, 6' 6" short bed, 4.8L V8.
"Easier install than I thought it would be, took about an hour. Sounds good, looks good." —David S from Velva, ND bought a Magnaflow Exhaust Systems for a 2004 GMC Sierra, 2500HD, crew cab, 6' 6" short bed, 6.0L V8.
"Easy installation, great quality fit. Sounds great without an excessive amount of interior noise." —David V from Indianapolis, IN bought a Magnaflow Exhaust Systems for a 2004 GMC Sierra, 5.3L V8.
"Great addition and easy application. Sounds aggressive like a truck should. No problems with fitting, but would purchase heavy duty 3" clamps from auto store since they seem to seal system better." —Mike M from Greenwood, IN bought a Flowmaster Exhaust Systems for a 2004 GMC Sierra.
"I put the 4" turbo back MBRP exhaust system on my 2004 duramax. It sounds great. Gives it a more "throaty" sound. I didn't notice any horsepower, but my main purpose was to get ready for a tuner, get some of that exhaust heat out faster. I love it. I am not the most mechanically savvy person, I was able to install by myself fairly easy." —Jason L from Filer, ID bought a MBRP Exhaust Systems for a 2004 GMC Sierra, Crew cab, 6.6L Duramax.
"I had an exhaust shop install my my magnaflow system along with banks torque tube headers. The four inch tip has a tuff look. The sound is deep and makes my truck sound strong. I have not pulled a trailer yet. But on the hi-way I gained 1.5 MPH." —Jody T from Montgomery, TX bought a Magnaflow Exhaust Systems for a 2004 GMC Sierra.
"Other than the directions leaving a little to be desired, this exhaust is great. It really added power and a fantastic sound to my truck. I would recommend it." —Dave E from Brighton, IL bought a MBRP Exhaust Systems for a 2004 GMC Sierra.
" Excellent product, excellent price, deep exhaust sound and you can feel the power in the upper RPM range!!! I am very pleased with their product, it exceeded my expectations!!!" —William S from Humble, TX bought a MBRP Exhaust Systems for a 2004 GMC Sierra.
"The flowmaster Muscle Truck exhaust is the best sounding ehxaust ever. I love the sound. But if you have nagging neighbors, this may not be what you want. lol" —Tammy B from Upper Marlboro, MD bought a Flowmaster Exhaust Systems for a 2004 GMC Sierra.