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The KM Straight Ace 3 inch steel exhaust system is specifically designed for HQ/ HJ/ HX/ HZ Holden sedans. This is a multi fit bolt on exhaust system to suit all V8's and including engine swaps. The KM straight Ace system is extractors back, it includes adaptors to suit the extractors on your car. The system is made up of a "X" pipe, 2 KM 409 mufflers and under diff tailpipes. It is designed to be fitted in your shed or by your local mechanic.