Per the specs on the BMC website, that filter is capable of 700hp...you're knocking on that door very soon, so I'd be worried if they'll suffice once you turn up the wick more via stage 3 tune, meth, upgraded turbos, etc. Are they special order because you need the inlet or the air filter to he ovaled? Unless they have an internal velocity stack, I'm missing their significance.
I'm going to contact local shops, so can I/we know the diameter of the piping where the filter connects and/or where it connects to the turbo inlet?
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