I recently installed an ACPT Carbon Fiber Driveshaft. I wanted to get some seat time with it before posting a review. The ACPT shaft is VERY high quality. I wish I had some pics to share.
Install -- Installation is very easy. Drop the old driveshaft, unbolt the rear section and bolt it up to the ACPT shaft using the supplied hardware. Reinstall. Total install time was maybe and hour and a half from dropping the old shaft and installing the new. I jacked up the rear high enough to prevent any fluid from pouring out of the transfercase tailshaft so this cut down on the time.
Performance -- NICE! If I had to discribe it in one word, it'd be: smooth. It made the car more pleasant to drive, overall. It feels much more responsive off-boost or when lugging around in the low RPM's. Acceleration is much smoother. Cruising is great, the car feels like it is gliding. Absolutely NO vibration issues whatsoever. I never had any vibration problems before installation. After, it smoothed out even more. I've had the car up to ~145MPH since it was installed and it's been silky smooth all the way. I definitely picked up a small increase in performance. It's not major, but it's noticeable to me. It also removed about 75% of my driveline 'clunking'. The remainder is most likely due to my rear diff backlash needing to be adjusted and the fact that I have solid lower engine mounts so there's little shock absortion there. It really seemed to smooth out launching as well. Wheelspin is a little easier to come by, now. I'm sure that's due to more power being transferred to the wheels instead of being eaten up buy the monster truck-like stock shaft. I've read people reporting the addition of a CFDS made the car easier to push. It's true! I don't plan on pushing my car much, but it did make it noticeably easier.
Overall, I am VERY pleased with the ACPT shaft. I was a little apprehensive since it retains the rear section of the stock shaft. This is definitely NOT an issue. The rear section acts as a shock absorber and a dampener and should be retained as far as I'm concerned. No shakin' and bakin' here.
The ACPT is definitely a must have!
Install -- Installation is very easy. Drop the old driveshaft, unbolt the rear section and bolt it up to the ACPT shaft using the supplied hardware. Reinstall. Total install time was maybe and hour and a half from dropping the old shaft and installing the new. I jacked up the rear high enough to prevent any fluid from pouring out of the transfercase tailshaft so this cut down on the time.
Performance -- NICE! If I had to discribe it in one word, it'd be: smooth. It made the car more pleasant to drive, overall. It feels much more responsive off-boost or when lugging around in the low RPM's. Acceleration is much smoother. Cruising is great, the car feels like it is gliding. Absolutely NO vibration issues whatsoever. I never had any vibration problems before installation. After, it smoothed out even more. I've had the car up to ~145MPH since it was installed and it's been silky smooth all the way. I definitely picked up a small increase in performance. It's not major, but it's noticeable to me. It also removed about 75% of my driveline 'clunking'. The remainder is most likely due to my rear diff backlash needing to be adjusted and the fact that I have solid lower engine mounts so there's little shock absortion there. It really seemed to smooth out launching as well. Wheelspin is a little easier to come by, now. I'm sure that's due to more power being transferred to the wheels instead of being eaten up buy the monster truck-like stock shaft. I've read people reporting the addition of a CFDS made the car easier to push. It's true! I don't plan on pushing my car much, but it did make it noticeably easier.
Overall, I am VERY pleased with the ACPT shaft. I was a little apprehensive since it retains the rear section of the stock shaft. This is definitely NOT an issue. The rear section acts as a shock absorber and a dampener and should be retained as far as I'm concerned. No shakin' and bakin' here.
The ACPT is definitely a must have! 
