Throttle body size...

[AzCivic]

Originally posted by OPAKRACING
well, if its too big, then i'll lose back pressure and that means i lose low end torque....so are you sure a 70mm would be best for a turbo b18c1?

You'll lose velocity not backpressure, but with a small fast spooling turbo it wouldnt matter too much anyway. I wouldnt even bother switching it out.