Originally Posted by sef

Looking at the pics I'd say that it has an aftermarket pulley on there. The standard pulley doesn't look like that (and doesn't rust)... Also looks like you have the 'Lohen protector' fitted... (stops things going south if the sc belt snaps). The exhaust sounds like what is called a 'one ball' mod... The standad exhaust has one of the silencers removed and and reroute pipe welded in its place...

Sounds like you have a car that has already been fettled performance wise by its previous owner... Where did you get it from? If you don't want to post details, drop me a PM instead... I might be able to find out some of the history...