I just bought a 65mm throttle body for my B18C1. I still have the stock GSR intake manifold ( Still waiting for the Skunk2 manifold, backorder for 2-3 weeks ). Anyways, if I were to mount this 65mm t/b onto my stock i/m, will I lose performance because of the airflow going from a 65mm diameter into a diameter that is smaller ?? I hear alot of people mounting up a bigger t/b into their engines but, are they losing performance without match porting thier t/b with the i/m ?? What should I do ?? Thanks for the help.

 

 

i'm running w/ a bbk 70 mm (got a good deal on it) on my stock IM, waiting for $ to either bore it out or get a skunk2. i dind't notice a drop in power, i noticed a much more responsive throttle and more power in the low-mid range.