For sale is a Thump Racing single bolt billet tensioner. I used this for 2000 miles on a Procharged 2 valve 4.6 motor. Helped reduce belt slip greatly. I am going to 4 valve which uses a 3 bolt tensioner so I no longer need this. Great for supercharged 2 valves. $320 OBO+shipping+ paypal fees.
http://www.lethalperformance.com/thump-racing-single-bolt-billet-aluminum-belt-tensioner.html
http://www.lethalperformance.com/thump-racing-single-bolt-billet-aluminum-belt-tensioner.html
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