Exhaust

[jayYZFR1]

Hi folks
I am going to build a full new stainless steel exhaust from the headers back what would best size pipe to use 2inch or 2.5inch to help the engine breath better...
Cheers
Jay

 

[subiescooby]

standard is 2.25 so 2.5 would be grand. Diameter doesn't matter a whole lot on the NA engines, but best to stay the same or bigger than standard.

Bigger diameters along with being a straight through will give you more noise, NA engines will end up being a lot louder than a turbo engine.

I had a 2.25 into 2.5 into 3 inch on my 2 litre non turbo and it was loud as fu*k and very raspy, I had to weld an extra silencer into it. Sounded perfect after that

 

[jayYZFR1]

That's for the reply...use to building motorbikes exhaust so just wanted to double check incase there something I might be missing building the car exhaust

 

[anto787]

Currently running a 2.5 inch system with a resonator in the midpipe into a japsport/toyosport back box ( can’t remember which ). Not that loud and has a pleasant rasp off of it, I have it paired to some unequal length headers from Mtuning.pl