American Made Schoenfeld Headers Anti Reversion Chamber, SCH-112530AR has a 3” inlet, 3-1/2” outlet and designed to reduce exhaust reversion which can give significant power and torque gains in the 2500-4500 rpm range.
Exhaust manifold 4-2-1 with anti-reversion chambers - Honda
SCHOENFELD 4 in Long 3 in Diameter Collector Muffler Insert P/N 42530
Headers 42530 INSERT MUFFLER 2.5INOD
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Schoenfeld 112530AR Anti Reversion Chamber Muffler Case Diameter: 4 Inlet Diamet : Everything Else
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Schalldämpfer Racing TITAN AdlerTech
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SCHOENFELD HEADERS ANTI REVERSION CHAMBER - SCH-112530AR - Exhaust