GTI Valve-timing
 

When I rev my '94 GTI past 4100 rpms, it gets a very noticable boost in power. I was wondering whether this was just the powerband kicking in rather strongly, or whether its a change in valve-timing to create more power, like Honda's VTech. Any answers to this would be appreciated

No the 8v didnt have variable valve timing. I think your throttle body might be dirty or air filter.. I'd open it up and check it.

Ya thats what I've been told. I'm getting a new filter, and someone suggested the spark plugs might be dirty which would cause that

It could be a whole lot of ish. Start by doing the maintenance first. Air filter, oil change, spark plugs, wires, fuel filter, etc..

Ya, the oil's getting changed tomorrow, the air filter shortly, and the spark plugs and wires maybe next week