mine dont leak, zero rtv used.

i got mine used so they have been on and off, and i just took em off again and reinstalled with no leaks from the cross over pipe at all.

i did weld a cat and new flex on cause i needed them both.

only place i used rtv was the 3 inch dp as they kept blowing apart, so a smear around the out side of the pipe at the seam, and the band clamp over it, and it never popped off again. it never leaked tho, just blew apart lol then loud leak lol