Well to make a long story short I was running a porsche and started hearing that dreaded rubber flapping noise, so I pulled it over checked everything out sure enough the serpentine belt was coming in a thin strip. They used the laser to see where the belt was coming off at etc and thought it might need spacers or bushings, I am pushing 750 whp with a procharger at 20 lbs of boost, I dont want this to keep happening, my shop advised the thumper single bolt tensioner 375.00 piece will keep it perfectly straight and prevent my belt issues, It will be here tomorrow and we are going to re tune with the new belt and new tensioner. I am excited, the tensioner appears to be top notch. Im excited.