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ATR SS headers for 86-87 Grand National. HPC ultra-high temperature ceramic coating (blue color, cost 450.00), HKS flange PROFESSIONALLY welded on crossover for HKS external wastegate. The high-temp wrap is there to protect the critical area at the passenger side control arm bushing, the crossover was slightly"squished" using a hydraulic press to give extra clearance between the control arm bushing and the crossover, otherwise the bushing would melt. This modification is important and is required for any turbo Buick header design that copied the ATR/KB design. NO LEAKS, NO CRACKS, NO EXCUSES. Provisions for OEM02 sensor and exhaust gas temperature sensor (type of sensor shown, I will provide part number and where you can purchase). If you do not wish to run an external gate simply bolt on a block-off plate, the flow will not be impeded in any way. Comes with everything, headers, crossover, V-band clamps, original ATR instructions & receipt for theHPC coating. I purchased these headers brand new when ATR was still in business. Will only ship to lower 48.