Review on Enhance Exhaust Efficiency with Performance Tool W80661 Medium Tail Pipe Expander by Kenneth Cotton

It will probably straighten out the dents in the collar, but it definitely won't stretch the tube for splined joints. I knew it wasn't meant to be used for this, but figured it would be cheap enough to try. The two flared parts broke in approximately the same direction when tested. I really can't imagine it being able to remove dents and such, but it can.