Originally Posted by Chapman1977
That's exactly what I have red somewhere - high flow cats in the 1M in the DP's as well as in the mid section...don't ask me where though.
Even if the mid pipes are also "high flow" they are no where as high flowing as a catless midpipe, N55, Maddad etc. Plus they contribute to drone syndrom very much, since just a mid pipe change cured most if not all of the drone issues among many users. So, I would say mid pipe should definitely be the first mechanical part (together with charge pipe they say, but I will take my chances on that one till my warranty expires or the thing just fails) to go in the case of a stock 1M, high flow or identical to regular N54 mids do not change this fact.
"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake.