e30 M50 swap exhaust manifold.

[trent]

One of the premier engine conversion guys (Mike at Sports&Imports) who has done over 20 conversions and sponsors some top club race and autocross guys (Bob Eveliegh and Tom Bleh) told me to go with the S50's for flow over the S52's.

Also, Terry Baker @ Atlantic Autowerks (6th or 8th @ the SCCA SOLO Nationals in an E30S50 SM car) who did my conversion, also told me to go w/ the S50's for superior flow.

The debate is over flow only. I realize the S52's are approx. 10 lbs less overall. I had the $$$ to do either one. I went with what the guys advised me for the cheapest/highest bhp. Do you have some verifiable dyno #'s to back up your belief? Not being nasty, just reeeally curious...

Yes, I do have backup information, but nothing that has happened directly back to back or than I can post on the wonderful Internet. I am also not going to name anybody I haven't heard of before saying "oh well they said it was the best." I know people who know things. I also might know somebody who has flow benched them. :)

[RedBaron86325]

Beej, who did you get those particular manifolds from?

[Beej '86 325es]

Beej, who did you get those particular manifolds from?

A guy named Wayne Maubry on Bimmerforums. Not sure of his alias on there though since the site is down. Why do you ask?

[ed94r]

Yes, I do have backup information, but nothing that has happened directly back to back or than I can post on the wonderful Internet. I am also not going to name anybody I haven't heard of before saying "oh well they said it was the best." I know people who know things. I also might know somebody who has flow benched them. :)

Then we have a conclusion then. If they have been flow benched side by side, stock for stock and the S52's are superior for flow then we have a winner.