Dynatech Vortex Cone Insert Muffler - Slips Into 3" Collectors 421995 074 Harmonic Damper - SFI

074 Harmonic Damper - SFI 918872E

1983-2004 Chevrolet S10

0-60 PSI READING FOR FUEL INJECTED APPLICATIONS

1989-1990 Chevrolet R2500 Suburban

and stock A/C vent

Dynatech Vortex Cone Insert Muffler - Slips Into 3" Collectors 421995 074 Harmonic Damper - SFI100% T 304 Stainless Steel Construction Compact Size Fits All Racing Applications Ultra Lightweight Less Than 1 2 lb. each Little or No Power Loss Easy Bolt Installation Insert Cones on 3", 3 1 2", 4", 4 1 2", 5" Turn Down with Insert Cone in 3", 3 1 2", 4" How It Works: The Vortex Insert Cone, installed near the exit of the header collector or muffler outlet, provides a large friction area to reflect and dissipate sound energy, thus reducing the dB