i would like to tell you all about a six branch equal length stainless steel manifold manufactured by BTB, in daventry.
I run a 325i mtech 2 with an alpina c2 2.7 engine, No 0495, it had its standard 6 branch manifold and performed pretty good, sounded nice with a lovely rasp coupled to a scorpion stainless steel system,
I purchased the manifold from SAL of XS PERFORMANCE, who also gave me advise on how to fit the manifold without much difficulty, the swop over took approx 45 mins, and the results are absolutely astounding,
I cannot put into words the sound that this manifold makes over the ALPINA manifold, and power is definately up with no flat spots whatsoever,
This really is a fantastic bolt on,
GOOSEBUMPS AKIMBO....................................................................
and because the car only does about 3k miles a year, stopping it from dissolving is more important than power or economy right now! the nearside rear arch had a pin-head sized buble on it when I bought he car nearly a year ago and now its full on - may have to replace the entire thing. just haven't gotten around to it.