05-04-2009, 01:01 PM
I think big pipes sound better. But smaller pipes give better off idle torque. With a 3" collector on the header I'd say the 2.5" pipes would be fine. You want the exhaust to have the smoothest route possible. So if you went with 2.25" pipes, your tubes would dump into a 3" then neck down to the 2.25".
'72 TBA...