| Hello Eisho, Like I mentioned in the email these driveshafts are not necessarily made to handle 500+ rwhp (twice the amount of a stock 300zx TT). I didn't say they couldn't handle it but again with a car that produces twice the amount of hp and tq of a stock 300zx AND a high RPM launch with slicks you will see driveline items start to fail. I also mentioned that we can make this right get the driveshaft over to us and we'll test it out. Last I talked to you, the driveshaft was suspected but it was not confirmed. It can still be other parts of the driveline as any driveline vibration will be exaggerated through a 1pc driveshaft. We also offer solid U-Joint for higher HP situations. I mentioned in the email that we will take care of you just get the DS over to us. We have no problem standing behind our products even in a situation where our DS worked fine for what it is intended to do so. We've had couple 400+ rwhp cars take hard launches @ the strip w/o issues but guarantying anything up in that range won't happen as there are too many variable. Drop me an email/give me a Call and I will take care of you. -JokerF15
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