one more question about this car....he used to have a b16 in it until he pulled that out to put it in his girlfriends car then he put a b18b in this with the b18 header...so now thats too short for the custom exhaust made for the b16...theres about an 8" gap...so would a GSR header fit?, or would i have to go with a b16 header?, or would i be better off to get the exhaust flange cut and moved up 8"