Yes 2 2.25 and 2 3" once. Napa has the best clamps or you could order the band clamps from FrozenBoost.com if you don't mind having them shipped. ZZP has the extension you need but you can save yourself some money and extend your stock o2 yourself. I would stick with a ZZP flex since I have yet to hear anyone having any issues with them going out. Copper rtv is optional. As long as your stock gaskets are in good shape. Clean them up and reuse them or you can get some Felpros. I also replaced my exhaust donuts since I was missing one. For the gaskets they should be in stock at the local parts store if worse came to worse and you needed to replace them.
