Hi Bernie,

You should go with my setup (see sig); I also have a 99' GSR

I did a full review of the Comptech I/H/E a few months ago; it has been archived here:

https://www.honda-acura.net/forums/s...&threadid=8484

I would recommend the Comptech icebox and 4-2-1 header, but a different exhaust if you want to go angled etc. The Comptech exhaust has a great sound but looks pretty generic. Hope that helps...

Shingo