<BLOCKQUOTE><font size="1" face="Verdana, Arial ">quote:</font><HR>Originally posted by FF/EMT-43:
While you're on the subject of ezhaust...is it recomended more often to hollow the cat and get a cat-back exhaust system, or full dual exhast (headers)<HR></BLOCKQUOTE>
Absolutely DO NOT "hollow" your cat! The engine needs the back pressure from the cat in order for the O2 sensor read properly. On pre OBD-II (pre.'96) the two factory cats can be successfully replaced with a single aftermarket high flow cat (I use Flo-Tech). This will retain enough backpressure for the O2 sensor, while improving power significantly. This is not an option on the later model because of the O2 sensor between the two cats. It is not wise to use "shade tree" modifications when dealing with computer controlled cars. You might get away with it sometimes, but the negative results can be far more expensive repair than it would have cost to do it right the first time.
[This message has been edited by mrboyle (edited 03-23-2000).]