Going to get the car tuned soon. It has a mugen intake and PLM Toda Rep Header to Mugen Twinloop Exhaust. Should I keep the stock throttle body on the car or swap it over to a 70mm. I have a skunk2 70MM throttle body I was going to use for something else. Thank you for the input.

 

You would have to port match the intake manifold to the rear exit size of the throttle body to maximize the effectiveness. I always like larger throttle bodies as they feel better due to increased engine response, if they can add a few hp then all the better.

 

Yea you must port match the manifold! the step will cause a dip in the air flow which is not good and may hold back power. Leave the stock TB on and the tune will feel good after. Even port matched your not gonna gain much from the 70mm anyway.