hm, well mine doesn't really bog. it's pretty damn peppy; i was rolling about 65-70 today and gave it about 75% throttle and the RPMs shot up to 5-6 and I didn't feel a bog. Granted I didn't feel a lot of pull either. I'm a GT still.
My front exhaust manifold was a little pinkish dusty upon looking after killing it.
IDK, I guess I'll just use christmas money and tax return money and get another cat put on because I don't want chip pistons I wanna keep my GP around for a while. Guess struts will have to wait.

I'm going to call the shop down the street tomorrow. What should I be looking to pay for the cat and to have it put on?

Oh and today is the first day the code came up so mine may not clogged enough to make a difference...yet. idk though i'm just guessing