i currently have a smsp with 2.5 collector, going through a 2.5 test pipe, all the way through a 2.5 mandrel bent kteller exhaust

which would "max" out the power on my mild build 1.8L? a full 3" exhaust after the 2.5 collector, or just keep the 2.5 exhaust and put a cutout right after the collector?

 

bump

 

best way to know is go dyno with the 2.5 then rerun open header.

go off the hp/tq difference, 0-2hp its not worth the trouble. 3-10hp it just might be.

I'd rather do the cutout.. open header is ****