When I cant sleep Ithink dumb quests.When I had a455 in my car ,2 1/2 inch ex. pipe worked o.k.with dual exhaust.I f I am building a v6 262 engine w/ stock exhaust manifolds,would 2 or 2 1/4 inch dual pipes work well enough?the car will wetgh about 2700 lbs.It will never cross 5000 rpm.