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I agree with Evo9. The PPK is a mild tune,hence it not voiding factory warranty. The JB4 would kicks its ass I'm sure. But for peace of mind and to add a little more kick the PPk is a good upgrade. I've had it for 6months and find it perfect for daily driving.
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08 135i |Alpine White w/ Terra Boston Leather|Sport Pkg| Premium Pkg| Shadowline| Gloss Black Trim| Nav| Comfort Access| Active Steering| Steptronic| Htd Seats| Prem. Sound/Sirius| Park Distance| PPK 1|BMS 4LED|M3 Sway Bar
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