Sound Proof Door

(30 mins per door) 1 door can do double layers, 4 doors can do maximum 8 layers.

After doing this will have drastic difference in door sound proofing increase speaker bass and reduce road noise!

2 Material, same quality just different branding: (now promo for vezel only)

Singapore Technology : $40 per layer (U.P. $50)
Autofun Brand: $50/layer (U.P. $60)