I have a 1998 GSR Turbocharged pushing about 8 psi. My question is , I have an exhaust cutout sitting around, and want to know which set-up would be better.

1 - 2.75" pipe from the cat back to the bend in the exhaust, then install the cutout (open to atmosphere).

2 - Get a highflow cat and a 2.5" catback exhaust.

3 - Install the cutout and move the cat backwards on the exhaust. I know this will run the car lean, but when I get it tuned will it be ok?

The car will be tuned.

This is for racing only and a few times for crusing around town. I want the safest/ most powerful setup. I am wanting to keep my car looking as stock as possible so the cutout would allow me to do that. And when I am not running the car I can have the stock exhaust to keep it real quiet.

 

You need a 3 inch exhaust. Then you have no need for a cutout.

 

The only thing is I already have the cutout and it would only cost about $40 to have it welded in. But to have a 3" exhaust I would have to spend about $400, for a good one.

 

To make the most out of your system though, you will need a 3 inch exhaust. Plus, you have a turbo GSR, you need to take care of it with good parts.