No Cat vs Hi- flow Cat vs Muffler

[clanbuster]

I have been changing setup here and there due to some mod on engine.

Currently 1.5CC engine with 0.6 bar and abt 140 BHP.

I had tried remove Cat, then my low end speed is really like snail. Even stock 1.0CC car also can faster then me.

I put back the Cat and is fine, but from 120Km/h to 180 now is just abit faster then NA car.
Before put back the cat, is very very very fast climb up to 180 km/h

Now what should i do?

Change to Hi -flow Cat?
Change muffler with stock Cat?
Change whole piping to slightly bigger diameter with stock CAT and Muffer?


is there any equipment that detect the back pressure is too much or less?

 

[clanbuster]

by the way, Cat back and Muffler, which one had more restriction?