Hi guys, Iv got a 2002 tw 125, and on the silencer there is a small hole at the lowest point on the silencer. I don't know whether it is a drain hole for the bike, or someone has simply drilled a hole in the exhaust. I'm just confused because there is definitely exhaust gasses coming from this hole, and surely if it is a drain hole there isn't supposed to be the majority of the exhaust gasses coming out of it. Also, when I cover the hole, the exhaust gets a lot quieter and the throttle response is better. Any idea's?