Originally Posted by BillBoost37
The tensioner pulley you can do in metal. The front idler pulley will need to be ribbed and plastic is the only choice I know of.
Both are reverse threaded. On the tensioner you'll need a T45 or T47 and the other also torx IIRC.
You can get ribbed 6 or 8 grooved pulleys, I have all metal ones on my car. I found that it was possible to heat the plastic pulleys enough that if rocks or dirt got in the vicinity of the pulleys that it would embed itself in the pulley.
I've been told the bearings are better on the metal pulleys but have no way to confirm that.
Only the 2 pulleys for the supercharger on the coil bracket are lefthand thread, the others are righthand thread.