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AR1-HDR4 kit features ACT's most popular Heavy Duty pressure plate
Includes O2 sensor extensions
AI2-HDR4 kit features ACT's most popular Heavy Duty pressure plate
AI2-SPR4 kit features a Sport pressure plate for a nice upgrade
5" muffler
PPE Engineering MR2 Spyder Race header and 2.25" HF Cat - 304 stainless (210007 - SS) PPE_CeramicCoating_4 AR1-HDR4 kit features ACT's mostMR2 Spyder Race Header and Sport Cat system The PPE race header is designed to improve power from 3000rpm to redline. Features 1. 5" 4 1 design with a long formed collector for smooth flow. Spring ball flange connection absorbs torque in the system to reduce strain on runners. The header is made of 16 gauge mild steel with polished ceramic coating. *requires high flow cat or downpipe to be a bolt on system, wiring is required. Choose either the 200cpi