throtle bodies

[JET]

The larger TB will make it harder to tune. Bottle necks in piping are odd if you don't know fluid dynamics. They add up over a length, so a short bottle neck like the TB really doesn't mean a ton, especially at lower flow levels. That being said it will still be a restriction. Are you going with 3" IC pipes and a free flowing FMIC? If you are going 2.5" pipes, don't bother with the TB, use a 1g one.