Ya everyone on TW says they leak and they dont fit right and stuff like that. I see the DT's on there and i have heard nothing but good news about those. I bet they will sound amazing with my magnaflow!
I have headers on my 96 5vz 3.4, and to answer your question they will fit meaning they will boltup to the heads, and they will fit under the hood. The only issue will be hooking up your exhaust to the headers, it might need some custom work, no big deal though.