I have worked along time in coming up with a way to install a world championhip ship capable audio and video system and still have a fast car that handles and stops great. The main problem is the weight, normally you end up with at least 700lbs added!
My idea takes alot of work and costs abit, my hands are cut to shreds from just doing two doors as they do not build them to work inside of like I do. Anyway, it is working very well, I expect to add less than 100 lbs of sound deadening and power source materials, my last install in a Tacoma, much less interior space, added over 400lbs to do the same as this will take for the Matrix.
Since my main income is from marketing my sound deadening mat and less is needed, I will be shooting myself in the foot when I let out the secret. Oh well, much more a car performance and audio enthusiast than a business man anyway

At least it is still based on my main product, luckily.
I am considering marketing my idea so cannot let it out now but will let all of you know as soon as I can. It does work, proved that already, want to let you, my fellow enthusiasts know too! I am not like most business people, I am in business to have fun. I just need enough income to have it, could care less about having a bunch of money. I have been living in a very exclusive neighborhood for the last four years, what a bunch of "f"ed up people!!!!
Anyway, I better stop all this yaking, get some rest and then back in the game tomorrow!