spending 600 bucks on a drive shaft is LUDICROUS. You want 6hp for 600 bucks, pay someone to procure and install some headers for you.
A common aluminum driveshaft is more than sufficient and will yield similar gains in all aspects (as miniscule as they are). Being that proud of 6hp is bizarre and disturbing to me especially when you can have a brand new aluminum model for 1/3 the cost and get 70% of the weight benefit.
When I put my aluminum DS on I noticed exactly zero difference other than I got rid of the driveline vibration that was the reason for replacing the stock steelie in the first place. Dyno runs showed only nominal changes in power output, not enough to even speak about (<5hp/tq). I've swapped to aluminum on both cars and the only difference has been about 7lbs.
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