what is the main differences in these 94-99 and 00-01 beside the obd1 n obd2a n obd2b...and the exhaust system..... i have a 2000 gsr...it seems that most parts r for the 94-99.....just like the greddy turbo kit....and some high flow cat....is there a differences in the 00-01....i've try converting obd2b to obd1...the P72 ecu..but the obd1 ecu..its secondary isn't working....i've try at least 3 p72 obd1 ecu already and doesn't work...i put back my stock (obd2b p72 ecu and it works)...i met a person that chips ecu....he said that the 94-99 and 00-01 has different wiring for the butterflies...but alot of people say that the obd2b to obd1 coversion should be straight forward...plug in ...and it should work....any way just need some info and help!.....thankz in advance....