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I went from sagging oem to poly and it’s for sure smoother and less vibration. That’s my opinion though, results may vary.

Poly motor mounts really opens the space up and they feel much better than collapsed rubber

yep, 6.5 drivers won't fit. I just cut and modified the aftermarket crossover to work with my 6.2 manifold. The downpipe is hard, there's barely enough room between the manifold and frame rail IF you have good motor mounts. Running outside the frame is not ideal but is the path of least resistance.

I'm T'd off the driver side where the pressure sensor is. Has been fine for many many years.

The 6.5 downpipe will not work on a square body, it will have to be custom, you can snake it thru between the block and frame rail and having good motor mounts makes a big difference. You can also run it outside of the frame but it doesnt leave a lot of room for a muffler or to get it to the...