SIMO888 wrote:di20t actually just from doing at tune and E85 tune its gone from a stock 127kw to 168kw so enlighten me how a 2.5i N/A will gain no power, you sound like the guys from MRT lol
Mate you're confusing what Im saying
No where did I say there's no power to be had from a 2.5 n/a (albeit 168kw sounds a little exaggerated for my liking).
In fact, assuming 100% volumetric efficiency (which is near impossible with stock cams), then your head would need to flow 225hp to make 168kw, or around 350cfm.
It would also need to be making this power at about 7800rpm, so I'm assuming your engine revs to 8000rpm here
To put it in context, a fuly ported and race prepped head i know of that was very recently assembled, flows 236hp n/a or 221cfm @ 28" and 0.050" lift (over 370cfm peak lift).
Back to the topic - my point is that the high flow cats are not restricting your engine flow at the moment and thus not worth upgrading in my opinion.
Was not hating. Good luck
Mick