my setup.. comptech sc with toda cams.
will putting a 3" exhaust be beneficial with the extra flow or is it overkill...
or will a 2.5" be more efficient..

 

Id say 3", thats just my guess as I know FI's like the extra flow. Im sure theres someone on here that can give more specifics.

 

i think you want a 2.5. the supercharger runs of the motor, so back pressure is required. if you had a turbo setup, then you should go with a 3''. im pretty sure that i will be buying a comptech sc, and i just purchased the dual r1 amuse, the piping is not 2.5 all the way through, it varies between 2.25-2.5. what ever way i will be going, ill be running the same setup i have. 2.5 is fine for low boost applications.

 

but will having the toda cams gonna need for a bigger piping due to the bigger breaths the engine takes?

 

i can't help you with that one. best advice i can give is to call toda up and ask them. but for a supercharger setup, id stick with a 2.5...

 

i did and they have no data on it....
since they only make parts for NA

 

You only need a 3" exhaust for a turbo set up...2.5" should be fine with SC.