This is an excellent exhaust system upgrade especially if you are looking to install the GNX suspension package listed here.įor the customer who purchased steel mufflers from ATR back in the day and have since rotted out or are in the market to replace your old steel ATR Pit Bull muffler click here. This project has been developed by Richard Clark, so you can be assured of a true quality fit and finish throughout. All new stainless guillotine clamps are included.Įach exhaust system is shipped in a single box weighing approximately 50-55 lbs. Each pipe is mandrel bent and tailpipes are angled cut and exit exactly in the same area as the originals. This system is a true 2-1/2″ diameter system throughout, unlike the factory which has bottlenecks in several places to 2-1/4″. These jigs are set to assure proper fit for each exhaust system. The first photo shows a set of the actual GNX tailpipes in one jig, and the front Y-pipe in the other jig. This exhaust system is made from 304 stainless and uses a highly polished center-to-center muffler. This system will not fit regular Turbo Regals, however, a GNX stainless exhaust system for the stock 1986-1987 Grand National is in development and will soon be available. All good things come to an end, and Buick decided to go out with a bang for its final Grand National. This GNX exhaust system will ONLY fit authentic GNXs and any 1986-1987 Turbo Regals that have been fitted with the reproduction GNX rear suspension systems. See our comprehensive vehicle overview for the 1987 Buick Grand National including production numbers, performance specs, factory colors, and OEM brochures.
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