Performance advice

[sa325]

Hi guys. this is my first posting on this site so pls forgive any stupidity. i own a 91 325i(South african).it has:17'Alpinas,MtechII front back kit and side sills(no door mouldings),40 mill drop. i recently had the head gas flowed and installed a 288 Billet cam. the bottom end is still stock.there are no branches just a 50 mm free flow and k&n flat pad filter with cold air induction
how big a difference can i expect by installing a branch and a 57mm free flow as well as a chip.
and,how do i go about doing a big bore throttle body coversion here in sa?

Will submit pics soon.
tanks guys!

[MONSPORT42]

Welcome to the zone. Sounds like you have nice set up there. You'll have to get some pics on here for us all to see. Can't give % gains to be expected but the larger throttle and 6 branch would certainly make the most of the gas flow and cam. Most gains probably at the top end of rev range though.
Throttle bodies are supplied by Ian on the site here on an exchange basis usually at Ԛ£125. I suggest you contact him and see what he can do for you.
alpina527@aol.com
Ant also supplies great chips from here so you might be able to arrange a single shipping for both.
chips@e30zone.co.uk

Are you up on the Transvaal or closer to sea level? Do you still have to use Sasol?!!