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Ratchet Drive Boss
Can Move The Needle From 0 - 8
and offers the maximum braking performance achievable short of installing a full-blown Balanced Brake Kit™
So when it comes to keeping your engine cool and your 1M/135i/335i/Z4 running at its best
Require BBK Mid Pipe Part # 1637 to complete installation
B&M Racing Shift Improver Kit (70239) 4019 Ratchet Drive BossThe B&M Shift Improver Kit the easiest way to get the performance you've always wanted out of your automatic transmission, two modes to select from: Heavy Duty, or Street Strip. It's our least expensive and simplest to install kit. Features: Provides crisp shifts on any stock automatic transmission Eliminates shift overlap, excess wear on clutches and bands due to slippage High quality at an affordable price Expertly made from premium materials Built