I dont know that it will actually hurt your bike. I believe a while ago someone dynoed with and with out one and they lost like a fraction of a hp. But it does no good for you. Some say they pick up throttle response and some just like the bling. I believe it may also cause the boots on the intake to wear faster and cause an air leak.
But hay it could be worse there only like 20 dollars when you could have got a power now valve for like 200.
Oh and mod your stock timing plate its free.