Ooh, found another "gotcha."
6th gen is 97-03, 7th gen is 04-08.
BUT...
It appears Pontiac changed the exhaust for the 03 model (last 6th gen year) and continued it into the 7th gen (for models with dual exhaust.)
I noticed this when looking for aftermarket systems. Some showed compatibility with 03-08 and others 97-02.
So I looked up various years on walkerexhaust.com.
Up to 02, the mid pipe is 2.5". For 03 and after, it is 2.25".
The outlet at the cat, and the inlet for the resonator, is 2.5" for both. But up to 02 the resonator outlet is 2.5" and for 03 up it is 2.25".
Did anyone know this? I haven't seen it mentioned anywhere that 03 reduced the exhaust diameter.
