Just bout a crew cab dually. 454 TBI, TH400, bone stock. Exhaust is original and still has the factory muffler and resonator behind it.
Wondering if its worth it to go to headers, and 2.5" true duals. Or just leave manifolds on and do the exhaust from them back.
Truck will be used to tow my 10k lb boat, so would like to free up some HP without getting into the engine at this point. Any other tips for upgrading power? More into the towing/torque than anything.