Hi, I don't have an NSX yet, but I'm still looking for one. I never post here, but I have been a religious reader for a few years now. As far as the oil filter, I can't say if the shorter Legend filter is sufficient or not, but when the G2 Legend first came out in 1991, it used the same oil filter (same part #) as the larger NSX filter. In 1992, for some reason Acura decided to make the shorter oil filter (different part #) for the Legend. I personally have owned 3 G2 Legends, currently still own my 93 LS Coupe with 6-Speed manual trans, and many of us Legend owners actually still buy the NSX filters (Original filter on the 91 Legend). Truthfully, I really don't know if the NSX filter is offering me any benefit, as the oil appears to be faily clean looking when changing at 3000K miles, but I personally would stick to the NSX filter. With that said, I look forward to coninue to read and learn from this forums, and hopefull I will join you guys as an NSX owner soon. Being from Hawaii, it isn't easy finding the right NSX as not too many are on the Island and the prices are always a few thousand higher than the mainland. When I'm ready I'll be buying one from the mainland.