Quote Originally Posted by ZeForce View Post
Actually, the intake piping should have 25% larger cross-sectional area than the throttle body, which is ~70mm for a stock VTiR throttle body
Remember that the actual butterfly is usually 10% smaller, in most cases. It is a simple rule of thumb. Not all people want to spend their time to work out the E=MC2 when installing an SRI. Its ment to be a quick and cheap effective mod for a mostly stock car.

No way I am knocking about what you said, just trying to give people easy answers.

Cheers