From experience I would not advise you to try to drill out sawed off studs, Its a bloody minefield trying to do by hand and a head off job to do otherwise, better to dremmel the nuts off somehow and then remove the studs after heating with a blowlamp....BUT personally although I dont know for sure I'll admit, but I doubt if the baby drag has restrictors as it wont be a powerful engine to start with so would all be just a waste of time if that's the case.