a tip - took the heat shield off, and for a week after stopping I applied penetrene whist hot to the studs, nuts came off with ease.. also used new "crown" locking nuts and used a very small amount of high temp silicone to all gaskets.. Another tip make sure you linish all flanges so they bolt up nice and flush ! This exhaust is made in a "jig" so the flanges need looking at ! It takes the stress off the flanges and the less stress the less chance of cracking.. Oh and it not a loud system , from the cab it sounds just like the original but you will notice the benefit !