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The 135i has a turbo in its exhaust path, which tends to quiet down the exhaust. It's not necessarily a valid comparison, 135i vs. 128i, to what the same configuration would sound like on a turbo vs. an NA engine.
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'11 BMW 128i 6MT
Titanium Silver, Sport Package, Cold Weather Package, Sunroof, Sensatec
DISA Intake, AA Header, MILV's, Stage FP Tune, VAC Motorsports Quaife LSD, CDV Delete, M3 Upper and Lower Front Control Arms, Powerflex Yellow RSFB’s, "Square" Tire/Wheel Set Up: Michelin PS A/S 3 225/45 17"'s on 17"x7.5" Type 262's
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