OK so here is what happened first of all i drive a S4 87 turbo II and i had bought it a Racing beat downpipe 2.5 for it. My cousin and I went to install it on the 7 when he noticed my manifold was cracked

and well its crap so now i want to get a new manifold but i was wondering if i buy an aftermarket manifold could i still use my Racing beat downpipe or do i have to get a custom one made? Thanks