Replacing the rear belt on the Stillen kit
 

My car has done nearly 30,000 miles and the rear belt (shorter one) is showing some signs it needs replacing , any tips or tricks?

It looks like the entire supercharger needs to be removed and turned upside down to get at the tensioner

Nope. Just get a short 14mm on there. Stand by the drivers headlight, reach in with your left hand with the wrench on the left of the sypercharger. Use your right to come in from the other side to help get the wrench on. Push the wrench towards engine to loosen. You can only get 1/4 turn each time but it only needs about 4 full turns then it turns by hand.

Remember to loosen the pulley bolt first.