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exhaust - OPF Question
I've been talking to Manhart about getting their axle back exhaust and catted downpipe and they're telling me I also need to buy their OPF delete pipe. Trying to understand why, it's been hard talking with them being as I'm not German. But essentially, I thought OPF was restricted only to EU cars so I'm wondering why I would need this unless it was just required to connect their exhaust to their downpipe if the standard US car can't for some reason. Not a pro around exhaust systems, wondering if anyone could give guidance. Don't see a lot of aftermarket Z4 m40i discussions.
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