trying to get the original back box off (2001 WRX) to put on a prodrive one but the bolts are rusted solid. tried soaking in oil but not working and have pretty much rounded off the heads. any advice?
thanks Mike

 

either take it to a garage and get them to flame cut them off and supply newones or goto halfrauds or a tidy motor factor and get either a nut splitter or rounded nut remover, like a socket with a sharp clockwise spiral thread that cuts into and grips the rounded nut.