ok so i got my coated pacesetters from club gp used going to an exhaust shop tommorow to have the y pipe rear header and crossover expanded to fit perfectly and plan on using new band clamps and a shyt load of rtv...now for this 3 bolt flange...anybody ever had the bolts tightened and the edges welded shut? would that work or should i just get a good gasket..? also my car is in the shop having trans work done but when i do the install will i have trans dipstick clearance issues with these headers?