Last June we revealed our very own Project 1 (v1.2). It was wearing an array of parts that suited the 135i well. We received many compliments on what we had done, however we were not finished. Our attention first went to the rear of the car. Bastuck had released a prototype US-spec quad exhaust system for the 135i. We still call it prototype as we feel the fitment is a little off for the US Spec cars with the charcoal canister. We did a little customization on our end to make the fit flawless and look like it was built in Bavaria. We are working with Bastuck to remedy the situation. The quad system just like the dual is a full cat-back system (aft of secondary cats) and utilizes Bastucks own non resonated y-pipe. We opted for the non-resonated version for 2 reasons; less restriction and so we could hear the engine sing. This exhaust really lets the turbo engine sound come through. Slightly more rumble, a bit louder, and a little more «open sound» made for music to our ears. This time around, we wrapped the 4 huge double walled 85mm Bastuck tips with 3D Design’s Carbon Fiber Diffuser. This is a 100% carbon fiber diffuser beautifully crafted in Japan. The 3D Design diffuser integrated seamlessly into the existing lines of the 1er while accentuating the aggressiveness of the car with its center mesh opening and slightly flared openings for the quad exhaust tips. Installation was simple, utilizing all the stock clips and attachment points as well as stock screws on the bottom

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