IMO, you need to cut the tunnel to get proper u joint working angles. When I say proper, I mean 1-2 degrees of working angle front and back. As low as we run these cars moving the engine down a little isn't going to gain the clearance needed in the trans tunnel to get a driveline angle that works well. With the high driveshaft speeds we are all after(5th gear at 100mph)smaller angles become critical for silky smooth operation. I wish I would've raised my tunnel. Otherwise, it's simply a compromise on u joint angles and vibrations of some kind will exist as your driveshaft speed increases. I'm still messing with mine to this day. Cutting my tunnel may still happen down the road.
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Todd
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