I'm think of TB'ing a redtop, I have 40mm's on my 1.4 at the mo, and Jenvey have said that these are "good" for 200BHP, I also have read that the smallest size possible gives better throttle response and drivablity. If I only intend to put TB's on and a decent manifold, then would these be fine as the engine would make around 190 ish (I'm guessing)?? Or should I get them enlarged to 45's??
Thank for any advice