Thread: Straight Piping a GXP?

No emissions here so technically you can remove the cat and not worry about inspections. Now you may run into a problem finding a shop that will remove it for you and also if you have any work done they may not touch the car if the cat has been removed.

By federal law you need a cat. Though many still don't run them.

Your car only has one cat, and removing it will gain you nothing. So its best to keep it for sake of never having the check engine light come on.

Straight piping will be very loud and after a little bit it will grow old and you'll want to add a set of mufflers to tone the sound down some. I'd just pick a pair of mufflers and weld then in. Keep the resonator so you don't get drone.

If you want some good sound delete the resonator first there will be no drone. If you delete the cat you will notice a little power band shift.

If you delete the mufflers too it will sound good....inside the car...but outside it will be a little too loud granted you still have the cat to tone it down a little but not the route I would go.

Replace the mufflers Something straight through...cherry bombs, dynomax ultraflows, magnaflows

delete res, stock mufflers. sounds great.

if you go catless youll need a tune. IMO regardless if you have a gxp you want a tune anyway. But i had 3' downpipe no cat 36' 3inch cherry bomb to two 3inch shorty cherry boms in the rear, sounds deep no drone, but a getting to loud, to many people think im trying to race them and ****.

You have a 3 foot downpipe and 36 foot cherry bomb?

Originally Posted by slick2500

You have a 3 foot downpipe and 36 foot cherry bomb?

you could only imagine how hard it was to weld all that piping underneath a 16.525ft car.