- Joined
- Jul 16, 2009
- Location
- Monterey/Falun
the runnners are a lot bigger ID then the b230 intake, a few years back I did back to back dyno pulls one with the b230 intake and a modded b21f intake. I ran a stock tb on both and I just welded injector bungs into it. the car picked up 14whp on the dyno jet with the b21f intake. also I did notice that the more I would crank up the boost with the b21f the car would actually make more power (this is over 25psi). with the b230 intake manifold I was finding over 25 psi nothing was really happening as far as substantial power gains, with the b230 intake the difference between 25psi and 30 psi was just about nothing