Engine Expansion Plug Kit 2001 pontiac firebird Muffler contains Polyphonic Harmonizer technology

Muffler contains Polyphonic Harmonizer technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean

taking approximately 30 minutes using OEM hardware in factory mounting points

BMR's MM004 polyurethane motor mounts limit engine deflection

offering robust reliability for street and track use

and Delrin

Engine Expansion Plug Kit 2001 pontiac firebird Muffler contains Polyphonic Harmonizer technologyAvoid corrosion in your engine and replace your rusty freeze plugs with PROFORM's durable brass freeze plug kits. All necessary plugs are included for one complete engine block. Made in USA.