Many of you have expressed a need to upgrade your exhaust system but didn't want to spend the extra $350 + installation for the RA/HO manifolds or headers. We have just completed these sample downpipes for standard manifold cars. As you can see they include the correct flanges. Notice that the pipe is 2 1/2" but is downsized for a couple of inches to allow for the flange to fit. After the flange is installed, the pipe is flared for attachment to the standard exhaust manifold.
We are looking for a GTO owner to test a pair of these downpipes for fit. If you are able to immediately install a complete system and can report feedback and digital pictures, please contact us for a special arrangement. $$
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Fool around, Get hurt, don't come crying to me.