T5s and vforce reeds is basically all the good mods that bike has. The boost bottle can stress the intakes boots and cause them to crack, and they add no power at all. You should be able to beat the 660 on that bike if you don't weigh very much and are a good rider. It all depends on what kind of shape its in to determine a price. If its been stored inside and well taken care of $2500. If its kind of beat up and needs bearings, plastic, tires, etc $1000-$1500.