i know the whistle is coming from the tb bc my tb on my fox did the same thing ppl swore up and down that i had some kinda turbo or s/c on there they never belived it was my tbThe whistle could be the tb. R series might be a little large for the current setup but it will help later on if i boost it. I dont knkw the cam in it but it does have a healthy lope. Does anyone know how to find out the specs on a cam without removing it?