exhaust help

**Evil Goat** · 03-05-2007, 08:35 PM

i have slp exhaust just the mufflers what can i do to increase the sound and horse power at same time...what can happen if i remove cats

**Tide** · 03-05-2007, 08:52 PM

Sound is subjective (taste).

Any number of things can be done: Headers, swapping the stock H pipe for an aftermarket H or X Pipe, new mufflers/catback, but it gets a bit expensive.

I don't care what anybody (or any marketing department) says: Catbacks and mufflers don't add any noticable horsepower, 3-5 horsepower at the most. I've found that most of your restriction is in your headers and h pipe. Futher, newer cars that undergo a significant exhaust change can actually lose power because the stock tuning doesn't correctly adjust for it. The factory tuning was such that it was set with a certain amount of back pressure.

If you go the offroad H or X pipe route (without cats), you'll need to get the MIL Eliminators to stop your CE light from coming on.

I would suggest long tube headers, offroad H pipe, and an aftermarket catback. If you go with the H pipe, make sure you get chambered mufflers (a la Flowmaster). If you go with the X pipe, straight through mufflers (a la Magnaflow) are the best match. Again, sound is subjective, but chambered mufflers with an X pipe sounds like complete ass, IMHO. It sounds blatty, obnoxious, like an old Ford pickup thats running headers only.

I can't stress enough that if you DO a header/midpipe/catback swap, to get it tuned for it. A custom tuner will be able to set your car up right, and you won't need the MIL's.

For an exhaust 'done right', you're looking at about $2,000 bucks, if you install it yourself.

**99blueZ** · 03-05-2007, 09:27 PM

^^^^^ well said. A great very cheap option is always a electronic cutout. Will make the car louder, and add a few to several hp depending on location.