There was only 2 different angled exhaust for the NSX. The old cats (NA1) have a streight pipe and gen 2 + gen 3 cats uses the same 90 degree angle for the front bank cat. The only difference is the welded on tips VS the bolted on tips. Euro NSX has the oval bolted on tip from 1991-2001! Acuras has the oval until 1996. From 1997-2001 they had a round fixed welded tip and from 2002+ they had the round bolt on tip. Why I know this? Cause I stock every exhaustFYI it's different between 1997-1999 and 2000+. Flanges are angled differently and wont fit each other.