Aftermarket Exhaust

[BoSoxFan]

Hey if anybody can give me some good advice here I'd really appreciate it. I've got an '03 and I'm just starting to modify. I've installed the Flowmaster cat-back, and it sounds great, but I didn't notice any performance difference. Magnaflow claims their system will give you about an extra 16 ponies. The new MAC system claims 24+. So what's the deal here? Is there really any difference between all these guys or is it just bull? I've also been told that installing headers and a high-flow cat mid-pipe is not worth the trouble because the stock manifolds flow good from the factory. Just trying to get varying opinions here cause if I can really get more horse out of another system, I'll swap out the Flowmaster.

[3-D]

Aftermarket mufflers are just for sound on these trucks as the stock system is very efficient. Maybe you will find a few hp but not many. However, if you up the boost, you may notice more difference. Many of the exhaust claims are made based upon a truck with increased boost. I alway heard headers weren't worth the trouble but I like mine (Kooks), of course I run a lot of boost. A friend of mine removed two of his cats on a truck with 10lbs of boost and found a lot of top end power, it just kept pulling. I think that these mods do make a difference but not as quick and easy as upping the boost a few pounds so people get discouraged and upset. You need to develop a plan of what you want to do based on what you want out of your truck. There are lots of other things to do before the exhaust such as intake, S/C pulley, e-fan, throttle body, chip, tranny valve body and traction aids unless you are just looking for a particular sound.
D.

[LightningForce98]

A lot of L owners with flowmasters actually see power losses with flowmasters. I have bassani on mine it sounds awesome.

[QIK KAT]

If you are looking h/p out of muffs forget it. But if you want great sound go with magnaflow wild set up. You will like it alot:tmb: . Also keep your cats on these truck thrive on back press. Not unless your running 13.5 pds of boost like i am, then you might want to invest in some long tubes& high flow cats;)

[BlueLightning03]

I just put a Magna-flow cat back exhaust on the L and it sounds sweet. I just love cruisin down the side streets and hear car alarms go off. My g/f thinks Im crazy cause I love it.