Looking at possibly dropping a 853 or 855 kit in my 1998 748 for next years track/race days. Any recommendations between either kit? FBF has both but just wondering if one is actually better then the other? I know there's no replacement for displacement but what kind of power can be expected....10-15 hp....TQ? I'm sure I'll need to find a burnt chip for either increase....any recommendations where to buy one or can it be tuned by a PCIII with the stock 748 chip? Thanks