I'm setting up a 350 sbc crate motor to power my little porsche 914. Is there any way to lower the 350ft lbs of torque by modifying the exhaust in any way. The idea torque range for this tranny is around 300 ft lbs. All Two Cents are welcomed.

Also, what is the most quiet Performance mufflers I can get? ( I'm still a newbie with Chevy performance). Thanks