My '89 740 just hit 200k and I am looking to treat her with some fixes and modifications and I would like some input. First, I replaced A/C compressor last year and still have problems. If I do a refit can I use same compressor and how much does it usually cost to convert A/C systems. Second, my parking brake cable(long) snapped the other day and want to know how difficult it is to replace. Third, I need to replace the long exhaust pipe, that is connected from manifold down exhaust to muffler, my parts guy has quoted me $200 for it, with gaskets. Is this reasonable? Fourth, drivers side front window does not close completely and I want to replace the window guide, inside door frame and under rearview mirror, can anyone tell me what the part is called and where I can get it? Thanks for any info.