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It goes on the drivers side. I needed it with my MAC H. We tried running it without it and it leaked so we put it on and its fine. I`m running the stock manifold.
The drivers side header sprostang? Hey, I finally got mine on, it cost me $70 to get new studs on both headers b/c of that rounded nut incident. But it's on and I like the sound. But it could be leaking cause there's like a tic sound when it's cold it seems. I haven't really checked it out all that close. I ended up installing it myself. Wasn't hard at all, but I could see the difficulty with that passenger side header nut.
Sorry man, I didn't use it, but I would imagine the curved end goes into the prochamber side, and the flat goes on the manifold side. I'm wondering now if I need it? Anyone out there know if I should have used the extra sleeve on a 2000 GT??