Quote:
Originally Posted by martymil
downpipes = substantial hp & noise gain
mids = no gain or loss in hp & substantial gain in exhaust rasp and smell
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That hasn't been my experience. MadDad sounds great, not raspy at all. There is noticeably more rich exhaust smell on cold startup, but not for more than a minute or two.
I am making 382 rwhp on a tractive brake dyno (corrected to about 431 rwhp dynojet, probably 450-460 crank HP) on stock turbos with K+N panel filter, intercooler and MadDad's as the only relevant engine mods. I don't think the midpipes hurt power.
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1M track toy mods: BMS chargepipe, BMS OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.