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Is a 34mm diameter throttle plate too small for a street tuned 1.6L motor with DIY IRTB? It appears that Jimmy @ Fuji-Racing uses 45mm AE111 throttles on his 1.8L and chokes them down to 38mm for the street (and uses 38mm long velocity stacks) but he says that he can choke them all the way down to 30mm depending on tune and desired results.