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And as for the original question about sport throttle bodies. Yes, without other mods these will be worthless. Boxster engines tend to be in their factory/standard form EXHAUST restricted. So they is very little to gain from intake modification without freeing up the EXHAUST first.
If you already did proper EQ headers, de-kat, a proper sportsmuffler, high flow air intake THEN a larger sport throttle bodie together with a ECU remap could be benificial...
Mark.
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