Any exhaust shop should be able to get these to fit on a stock 2005-2006 GTO Exhaust.

Inlet Size: 2-1/2 inch offset inline
Outlet Size: 2-1/2 inch offset inline
Case Size: 4 X 6 X 9

Description:
Our Super Pro Street Series is a direct descendent of our very popular Pro Shoot Out Series, with slight modifications for more efficient sound reduction. Even though it was intended for street use it has found its way to racing events with winning results. These are the oudest Spintech Mufflers made. Product may vary from image.

Note: This part is sold for custom applications. Please insure fitment prior to ordering. Restocking Fees will be accessed!