Exhaust

[max out]

Have read some about exhaust but was wondering if there are any HP gains with the 4 inch system or if it mainly just lower exhaust temps?

[Heartbeat Hauler]

Banks 4" exhaust reports "up to" 18 hp and 20ft/lbs of torque. So that means anywhere from 0 - 18 hp. I think that the 4" exhaust's greatest benefit is lower EGTs...my 2 cents.
JP