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im running a 1 piece steel driveshaft. Works great and no vibration issues yet. I guess the guys that made it did a very good job at balancing the shaft. Also if your motor mount is not secured all the way down (as low as it can go) this may cause some vibrations.
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 1997 Nissan S14 SE Redtop SR20DET @12psi
1999 Honda Civic Hatch EK9 N/A b16a2 (SOLD) 
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