Thats only for the L36, which is the non-supercharged 3800. Taylor has no use for this on his Supercharged 3800. If it was available for the L67, which it kind of is with the throttle body spacer, it has a very minimal gain anyways and isn't worth it.

ok i feel really dumb right now.but....what the **** is kr?i know alot about cars just dont know what kr stands for.

Knock Retard. It is computer induced timing retard due to knock detection.