I did manifold to downpipe, and vice versa. Leaks will happen trust me.

 

i've done 3 exhausts on my cobalts, and about 6-7 other headers and/or full exhaust on other peoples cars. and never once had a leak from the manifold, and also never once replaced the gasket.

i'll trust my experience, over someone who takes the car to the shop to "get what they want done"

now you're just making yourself look silly. i'm done in this thread, my point has been made.