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BMS is a 3.5, AR is a 4". Might not sound like a lot, but does have proof in numbers. There is also a CP-E 5" lol, if you want to sound like a dump truck.
ISO is a simple mod that makes the JB4 stage 2 a lot more stable and more consistent in the boost numbers.
Flex fuel is a must if you plan on running E85. Cheap for sure, but a pain in the ass to install.
I bought all my stuff through Terry, Mike, or private sellers on the forums. That's it and never had one single problem. Quick tip, always check the user iTrader comments. It's helpful.
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Sold  2011 BMW 135i - COBB V2 AP / VMR 710's / 4" AR Catless DP / BMS Intake w/ Air Scoops / Eibach Pro Kit / MadDad Street Series Axle Back / ER Charge Pipe / BMS OCC / Vorshlag Camber Plates / Sammich Sticker |