N4cer

iTrader: (11)

I'm needing to put headers on my car. I have a local with a set of used LG Streets with X pipe for relatively cheap, but want to weigh possible advantages to other sizes. This setup (as most on here already know) has 1.75" primaries with 2.5" X-pipe.

I'm wondering on a P1SC car that will always be 600hp or less, have you seen any advantage to 1 7/8" header primaries? Or 3" X-pipe instead of 2.5"? Or both? And if you have seen those gains, what exactly did you gain? Thanks.