Our heat exchangers are based on the original 914-6 heat exchanger. We use 304 stainless steel with all bends made with our CNC mandrel bender. All weld areas are purged to ensure high quality welds. We offer these heat exchangers in both 1-1/2″ and 1-5/8″ diameter primaries. This allows the client to choose the correct heat exchanger based on mild to wild engine builds.