i just had a look at the prototype exhaust for the falcon 250 from Throttle exhaust. It looks and sounds awesome.
I even had a chance to ride it around. I was blown away by the improvement in power and smooth throttle response! Needless to say I ordered one then and there. If any one is interested you should call the off road outlet at 714-744-2887. I only paid about $250 for the header and silencer combinded. They also had prototype pipes there for the 90,110,and 150. I rode the 110 and it sounded super mean but I don't own a 110 so I didn't really have anything to compare it to.
I will post some pics as soon as I have a chance.