I want to put a cat back exhaust system on my 03 L. What are you guys running? I like my exhaust loud and I like the drone. Have any of you guys ever herd of OBX?

 

Iv heard some guys running the OBX headers. Haven't heard any complaints.

I would start with a set of long tube headers before I would do a cat back.
Depends on how much you want to spend.
Here's some nice stuff but its costly...lol
.: Johnny Lightning Performance

 

With the stock mid-pipe with its 4 cats, yes 4, you wont get much more noise. I use the Bassani catback with the Dynatech longtubes and hi-flow cats. It to me sounds great. However, long tubes dont offer much of a gain on a otherwise stock truck. I'd recommend you do the Bassani cat back and delete your 2 rear cats. You would have ofcourse have to get your rear O2 sensors turned off in the tune. I think this would give you the sound you're looking for.

 

I have the JDM/Magnaflow catback and I like it alot.

JDM Engineering

 

+1 sounds great

 

Kooks longtubes with Magnaflow cats and muffler here. Sounds great and got me about 20rwhp. Sounds like you want it louder though, so the dual muffler version might be better for you.

 

There is a guy over on another site I frequent with dyno proven results.
He added long tube headers and high flow cats,,and picked up 30 RWHP and 35 torque on a NA 5.4!
So,,yes,,,you will see a good increases in power with long tube headers!

I like the high flow cats because it made my truck sound so so much better...lol

 

01 here with dynatech longtubes,highflow cats,glasspacks!!! Best sound ive heard yet and ive been around lightnings for a long time.565 rwhp