Next year iam goin to have an exhaust made for my old bm, before i go down that route i was considering an exhaust manifold swop.
M3 headers being the best option, but there expensive (£200/300).
Will the manifold of a 328 make any difference?
They look different, but will they produce any gains that are worth the effort?
All the bolts are seized in and rusty, so it will be a a lot of work to remove the standard items.