a little off topic but, i just got a high flow cat installed and the guy said i needed a new 02 sensor (not on the header, the one on the cat) and told me it would cost $270 CDN (approx 170 US) but i said no and just used my old one...it was stuck ot the stock cat and he had to heat it up just to remove it...it looks rusty but in my opinion still good...i beleive it was the original one and never changed...my car is a 97 Accord...do i need a new one soon?