whoa, I wouldnt go as far to say a 318ti is the same w/ different body panels, the ti's are essentially e30s with 5 lug... They have the same rear trailing arm components which are nothing like those of the e36 models... yea you OBD deuce guys are screwed but as far as OBDI cars EAT and conforti are the only chip sources I would use personally, EAT however is a little more, not sure quite how to say it, but 'homebrewed' technology if you will, but he gets his stuff right on the money... And will burn custom chips

Im not so sure that the extrude honing process would be beneficial on a tubular header piece?

Or are there cast units on the e36 318 models? IIRC my 94 318is has a tubular style header though but havent really paid much attention as its just a street car