i just put fmf fatty exhaust, boyseen reeds, boost bottle, and has k&n pro flow kit and i want to know what the top speed i could reach with these mods on my 2000 banshee??

 

I would say about 130 to 140 mph..

woo hoo

No really...with stock gearing...Probably about the same top end...maybe a few mph faster than stock....Unless you went with torque pipes. No faster than a little under 80 mph i would guess....
You might get there a little faster though...you should see increased throttle response and faster acceleration.
I believe a stock banshee tops out a little over 70....