I know the 99 cali specs are PIA's with the swirl valves and such...but i belieive i have a 98 cali ...whats the difference between a 98 fed and 98 cali...i cant seem to find much of a difference if any??

 

4 O2's - I think the swirl vales are exclusive to the 99 Cali.

 

But ive checked my metal plate under the hood, and im pretty sure that it says my 98 is a cali car. i know the 99calis have 402's...but my 98 only has 302 sensors..whats the difference if any with a pre 99 cal spec from fed spec?

 

cali- precats...fed-none

 

At least pre-cats. One pre-catalytic convertor in each exhaust manifold bank. Also the location of the 02's. It's worth switching to factory fed spec exhaust manifolds if not headers.

 

Well when the time comes i planned on getting aftermarkets without any precats anyway....so what ur saying is a 98 fed spec has no precats in the y pipe....nice to know....and man am i glad i havent got a 99 cali spec! i had to put a knock sensor in and im glad i didnt have to contend with the stupid swirl valves that come on a 99 cali!!

 

Just get a y-pipe and done. My car is a 98 Cali too....I've compared it often to my buddy's 99 Cali. Way less complicated. Mine has 3 O2s total, 2 for pre-cats and 1 for the main cat. That's it.

 

Every A32 4th gen has pre cats, both Cali and fed. Fed doesn't monitor them, Cali does.

 

Ok! I stand corrected...