The longer cross over pipe and at the manifold I used a tail pipe sealant from a auto parts store, I don't know how easy it's gonna be to get it off again but they said it's supposed to dry and act like a gasket not a glue so it theoretically should come off again when I want it to. With a stock pump I would imagine you should be able to hit about 10-12 psi at 3000rpms with pump maxed if everything is working properly. Sealing my uppipe was a world of difference and I didn't have a very big leak but could hear a slight exhaust 'ticking" sound so I knew it was leaking a little