I got a fully built LS vtec, skunk2 many t3/to4e borgwarner 48 turbo and was wondering what size of IC piping be best? like 2.25" for turbo to IC and then like IC to many 2.5". Or just stick with 2.25" all around or 2.5" all around. What Throttle body size be good also? thinkin of atleast 65mm? and would like to have good throttle response. psi range 12-14 daily and like 18-22 at track. comments? advice?

 

2.25" from the turbo to IC and 2.5" from the IC to TB. Pressure drop sucks

 

Anyone else, great thread I was wondering this myself.

To add, what material? Aluminum or Mild Steel?