I started mine the other day without the exhaust on and it was so loud but loved the deep rumble it had. To bad it isn't legal...
Thats great that you have a slip on for the zxr250. I will come down and have a look today after work.
I rode my ZXR around for a few days without it. Best Noise Ever. Only downside was the drone was so incredibly loud it actually hurt after about 10 minutes
You need a new exhaust. Hahahah. Once my forks are on I will gonna buy "the frame" and make one of these with the DIC exhaust