I have ordered a new stock head pipe for by GT 1.9 from Opel GT Source and am having some concern on how best to proceed with removal of the old pipe. Looks like the front bolts at the head can be removed from the bottom, but the rear bolts may be a problem. Would it be easier to get to them by removing the carb and going down from the top of the engine? I assume that most if not all the bolts will break off and have to be drilled out. Any tips will be greatly appreciated.