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Holden HQ-HZ (Fitted with 5.7-6.2L) Engine Swap TUNED Design Headers Manual & Automatic Transmission If you're looking for headers designed for maximum street performance, look no further than PCE headers. They are made from mandrel-bent tubing for superior flow and greater horsepower. They have thick flanges for a long-lasting, leak-proof seal. WHY USE MANDREL BENT EXHAUST The results are smooth , uniform , constant - diameter bends that greatly reduce restriction and improves both the performance and efficiency of your engine Replaces Pacemaker PN: PH5342 | 5342 | ||||||||||||||||||||||||||||||