4 inch driveshaft?
If it can fit you budget I'd get a CF driveshaft..

Shaft for AWD DSM pictured... Eliminates a hanger and two shorter shafts...
Myron Cottrell
President, Tuned Port Induction Specialties, Inc.
Previously, my car had a nasty vibration with a straightened and balanced steel shaft (3.73 gears in the rear now) starting around 75 mph and continuing to 95, then smoothing out, then continuing on and off through WARP 1, WARP 2, etc.
To the test drive: I noticed the difference with the carbon fiber shaft immediately, say from 20 mph up. SMOOOOTH. Wow. Reminds me of my neighbor's Lexus! I had no idea how much NVH was transmitted through that steel shaft. It was a VERY noticable difference; heck even my fiancee (who couldn't tell I put Eibach springs on my car ;-)) was the first one in the car to say "why isn't the car vibrating like it use to" (she doesn't know about the carbon fiber shaft expenditure - I told here we were just going for a ride :-))
Well, I accelerated up into the old "come apart at the seams vibration zone" and guess what? COMPLETE elimination of the vibration. I continued to WARP 1, WARP 2 (screams were coming from the passenger seat at this point) as STILL no vibration.
Objectively, I can say this has been the best money I've spent on the car (next to NOS of course :-)). It's much smoother AND seat of the pants faster. Next week will be the dyno test. If I don't see ONE extra horsepower out of this thing, I WILL NOT CARE - the money spent was well worth elimination of that DA%# vibration I've been dealing with (even when I tried the aluminum ILE shaft).
I am not affiliated, blah blah blah ... with ACPT in any way, and I PAID, with my own hard earned money, for the carbon fiber shaft. This shaft just plain WORKS!! Thank you James Leslie at ACPT for a SUPERIOR aftermarket product.


