View Full Version : Aftermarket Exhaust
04-12-2004, 12:03 PM
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.
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.
05-05-2004, 05:32 PM
A lot of L owners with flowmasters actually see power losses with flowmasters. I have bassani on mine it sounds awesome.
05-06-2004, 04:38 PM
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;)
05-30-2004, 01:19 PM
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.
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