Originally Posted by chefred112
x2...it all depends on the engine and the mods on it...for most guys 3" is TOO big (and will lose low-end)..but, with my mods I needed 3" duals to get mine to perform at optimum..
Fred, you're right but most guys don't have as much power as you.
I've been told that "as a rule" if you've got less than 500hp at the crank that 2 1/2" tubes are right for true duals. If you have over that then 3".