u have the gasket right(for the greddy vavle)? if u dont go get one, and get rid of that dam airbox.....a hornhonking hmmm that doesnt sound like a boost leak. also oil will come out of the shitty plastic oil caps, best to go get another one at advance or something. but yes also test for leaks cause they can do some funky stuff, that leak could be y you can accellerate anymore.