Not a lot u can do to these, i have a c30 d5 with 62mm hybrid turbo, airtec intercooler, 3" turbo back exhaust, k&n filter and 4 bar map sensor, and pulled 256bhp, 527nm @22psi of boost. Theres next to no aftermarket support for the fuel side so within reason, this is pretty much as far as ya can go on the engine side
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