Aluminum Driveshaft and Cold Air Intake

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2008 Mustang GT; Advice desired on Aluminum Driveshaft and Cold Air Intake
Car is all stock with no mods at the moment.

I am not sure what information you are seeking, but for the Aluminum driveshaft, I went with a "Spydershaft" from Ron Leaonard, Leonard Racing Products

It's a high quality shaft with no adapters of any kind, Spicer HD joints, and cheaper than any other shaft i alooked at.

As far as the CAI, I went with K&N back in July of '05 and have been very satisfied with performance, quality and customer ervice. There are a lot of CAI kits out there I hope you get a lot of responces.
 
Why would the stock DS be a must to reach speeds of 140+? I would think an aftermarket aluminum shaft would be more than likely be able to handle 140+ if not made to.

The stock driveshaft has a center bearing allowing it to articulate with rear suspension motion and speed. This reduces the effects of high speed as well as mismatched pinion angles unlike a solid one piece which better be dialed in correctly or it would wobble and wear drivetrain components out quickly.
 
Why would the stock DS be a must to reach speeds of 140+? I would think an aftermarket aluminum shaft would be more than likely be able to handle 140+ if not made to.

Nope... As said by walter, it has to do with the rear suspension, angles, etc.

squidd, a member of AFM, learned everything about the S197 driveshaft design in his quest to go over 200mph. He tried I think 3 different types of 1 piecers... He had vibrations on each one.

He put stock back... No vibration!!! :p