Sounds about right. I dynoed my M3 at Carbconn back in 2009 when I lived in Seattle. Stock with just Eisenmann muffler and drop in filter it put I believe 338whp and then with aftermarket Fabspeed high flow cats, Eisenmann, and filter it put down 362whp from what I remember. Definitely impressive numbers for the 1M!
2012 Audi R8 V10, 6MT, Suzuka Gray, Capristo X-Pipe, Klassen M52R, GMG springs, GT tails, GT wing, Cosmetic mods
2015 BMW X5 35d, Mineral White
2017 BMW M3 ZCP, Mineral Grey
Previous: w205 C63S AMG, e82 1M, Several 911's & M3's