i can't get a straight answer for this so hopefully somebody can help. my up pipes are leaking, bad. i heard i need to replace the pipes because they don.t use a gasket, the expand with heat to make the seal. then i have hear that they use a gasket. also they say i will need a turbo y manifold because i will break the bolts off from the up pipes. also whats the chevy doughnut gasket about. some body please help set it straight!