The Complete Car Door Sound Deadening Kit For A Pair Of Doors: Stage-4 This is the go-to kit for those who want to take their door treatment to the highest levels, a real one-and-done solution. Sitting above our most popular Stage-3 kit, Stage-4 adds additional layers and materials that allow for even greater noise reduction, further improved midbass performance, a potentially time-saving and easier fabrication & installation of block-off plates, and a more refined driving experience overall. It includes everything found in Stage-3, plus added components to help seal large access holes and further block external noise: ResoNix Mega CLD Squares, original ResoNix CLD Squares, ResoNix Fiber Mat Black Edition, ResoNix Guardian, ResoNix Barrier, ResoNix CCF Strips, ResoNix CCF 3S Tape, ResoNix Butyl Rope, and a ResoNix Roller. This kit is designed to reduce panel resonance, eliminate rattles and buzzes, absorb airborne noise, block sound through openings in the inner skin, and seal your midbass drivers to the grille or trim. While Stage-4 isn’t always necessary for every vehicle, when your doors allow for this level of treatment, the results are unmatched by anything else available.   Kit Includes: 20 Square Feet of ResoNix Mega CLD Squares 10 Square Feet of ResoNix CLD Squares 1 Box of ResoNix Guardian 1 Sheet of ResoNix Fiber Mat 1.0″ OR ResoNix Fiber Mat 0.5″ 1 Sheet of ResoNix Barrier (7mm foam) 1 pair of ResoNix CCF Strips 1 Roll of ResoNix Butyl Rope 1 Roll of ResoNix CCF Decoupler 3S Tape 1 Roll of ResoNix CCF Decoupler 3F Tape 1 ResoNix Roller The normal price for these individually would be $1360. We are offering a special on this kit for 16% off! Note: Please make sure your doors can handle the thickness of Fiber Mat 1″ before purchasing. MOST cars can without issue. If they cannot, use Fiber Mat 0.5″. If you need help, feel free to contact us for guidance. Please be aware that some individual items may be on backorder, and will ship when they are back in stock. To check the stock of an individual item, check the item’s individual product page, linked above. Thank you.