Best thing to do it go to a decent dealer. Get the exhaust, performance air filter and all the set up kit...
It will cost a bit, but the fuel air mixture will need to be changed as more air will be going in.
Exhausts start from £250 (Scorpian - what im getting) and go up quite alot. And K&N air filter is about £45
hope it helps
My insurance for mine was £1500 Fully comp, personal cover, helmet and leathers, injury cover, breakdown cover the lot..... Bike is 3500...... and errmm yer, i crashed it
God help me next year