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2003 GMC Sierra

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2003 GMC Sierra

dirtgar dirtgar
New User | Posts: 2 | Joined: 01/09
Posted: 01/12/09
08:08 AM

Hello eveyone I wanted to know what kind of mods work on a 2003 GMC Sierra 5.3 V8 4x4?  So far I have a AEM Brute Intake which feels like it helped, then I just installed a Supechip which I cant really feel and improvement.  My next step is a custom cat back system, Im planning on going with a 3.0 Inch wide exhaust pipe and a magnaflow or cherry bomb.  

Enthusiast | Posts: 494 | Joined: 11/06
Posted: 01/13/09
11:26 AM

three inch is a bit big for a mostly stock small block. i'd call magnaflow and see what they suggest for your motor before buying.  

2005john10 2005john10
New User | Posts: 2 | Joined: 03/10
Posted: 03/09/10
12:53 AM

If I were you, I would go with 2.5" exhaust pipes and whatever muffler that you want to run 2.5" should work very well with a stock motor. It also will support plenty of hp for more upgrades later. You should think about installing headers too. Headers  would really  make a new exhaust sound good.