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You can still buy brand new a 2.25" manifold pipe for an Aspen/Volare that should fit right under the hood of your '72.
Mmmm...nope! The F-body headpipe configuration is totally different from the A-body headpipe. Remember, the F-body headpipe snakes under the oil pan, across to the passenger side of the car and rearward from there. The A-body headpipe does a couple of bends and zags down and rearward without crossing over to the other side of the car. But you can cut the top seven-eight inches off an F-body headpipe, bolt it to the exhaust manifold, and have an exhaust shop weld on from there (that is if your shop can't manage to put together a 2ΒΌ" headpipe and flange...which if they can't, you might should think about using a different exhaust shop!
)They are pretty cheap from what I remember. Contact MiDi for more info... he is the one who showed it to me.
From there, use a magnaflow. I've run a 50 series flowmaster with 2.25" and it sounded nice, not loud by any means, however, all flowmasters and knock-offs can produce quite a drone around 60 mph.
Just watch out for MiDi's 64 GT, he's got a helluva fart can stashed under his rear bumper.
~THOR~[/quote]