Well I did a search and saw some options.

I was thinking of getting the RB pre silencer which would replace the pre cats and the cat.
Now the Pipe which replaces the cat has the auxillary/emissions hole.
I was wondering would that actuate the ports?

Also on RB's site they say you can't use the airsomething(pump,control?) and it comes with block off plates.

Also for cat back.
I have heard single is best for N/A's.

I was thinking of buying some muffler and then having a local shop make me the piece.

I like the look of the N1's and I want something like that.

What would you guys recommend for a 88 GTU?

This car is my daily driver so it can't be very loud.