964 Exhaust Question

[Mike Andrews]

Joe,

 

It's a sickness isn't it

 

With the number of people that have already done something similar I would also think you'd be ok.  As Larry suggested, to get the most (power) out of this you could have the car put on a dyno and have them do a custom chip if the A/F ratio needs attention.

FWIW, you could just pick up a European pre-muffler to put in it's (the cat) place.  That will still look like a cat (to the untrained eye) and the car should still pass emissions. If you still wanted it a little louder, you could replace the rear muffler with a by-pass pipe.  The muffler that goes under the right side behind the tire is pretty efficient.  That’s the way my RS America was setup and it sounded pretty nice.  Not too loud but you could tell it was different.. 

 

As to the airbox cover.... if you can find an extra stock one, you can cut it or drill holes in it.  Or you could just cut up the one on your car, but most people like to save those parts just in case they want to go back to stock.