Flowtech Real-Seal header and collector gaskets are a revolutionary break-through in exhaust sealing technology. Constructed of separate layers of "Dead Soft" aluminum, Real Seals provide a do-it-once solution that will not burn or blow out. Real-Seal gaskets will work when an o-ringed gasket will not because the "Dead Soft" aluminum conforms to create a leak-proof seal. Real-Seals can also be easily trimmed for port-matching and you can use them over and over again.