on USA flea bay at the moment is a 4" down pipe, that tapers off into 3" to fit centre exhaust flange....is there any gains to be had with this 4" system? ive never seen a 4" one before (no jokes please)
i know its good to get rid of exhaust gasses but is 4" an overkill? considering it goes back into 3"
maybee if it was 4" all the way out i could understand.
any thoughts?

 

https://www.scoobynet.com/scoobynet-...-sti-jdm.html;

 

Spoke to Richard at Powerstation yesterday he said there was nothing to be gained in opinion.

 

4" DP on UK fleabay as well, of course in the US bigger is ALWAYS better, over here we know better!

Simon

 

just as i thought guys, thanks.

does anyone know why this got moved? i thought it was just information i was posting??

sorry if i transgressed.