Hi!! I have a jdm H22 with f22b1 internals (crank and rods with H jdm pistons).I replace my Tri-Y header for a VtecKidd Drag race header,With the tri-y and 2.5" exhaust setup the car made 210 and 170 wtq,now my question is can i benefit from upgrading the exhaust to a full 3" with my current header or should i keep the 2.5" setup? I dont want to lose torque but i would love to have a nice gain in whp.

 

3" +
why is everyone, going with such dinky *** exhaust diameters..

Everyone should go at least 3"..