So I want to do a catless, single-resonator, late-model manifolds exhaust upgrade, and don't have the equip and know-how to do it, so I'm gonna get a guy out in the boonies to do it for me. Question is, to save money, can I cut off the down-pipes to the resonator and install the manifolds myself and leave them open? Would the hot exhaust exiting bake anything important?