Hi guys, just looking for some information around the difference to power with different throttle body sizes.  i made some enquiries as to what was available under the EFI section, but if I was to buy a HPI 51/18 throttle body for my 03 Fatboy to go with my 95" upgrade with CNC ported heads and a static compression of about 10:1, and using either 37 or 54 Andrews cams someone said it may take away from my bottom end power, can anyone elaborate on that or would I be better off sending a 43mm manifold off and get it bored to 48mm.  I am spending dolars now so I want to get it right