How to fix it?
 

My box is in the trunk on the passenger side with my 2 10''. The problem is the trunk floor is too smooth and the box move and is'nt stable on the road. I think that I can't do an entire new floor without be illegal so how can fix it and stay Street A legal?

Get some heavy duty velcro and put it on the bottom of the box. You could mount the box on a board as long as it doesnt extend out of the cargo area or put the box above the window line and still be db drag legal for street class

does that box looks familiar or WHAT?

lol. you took the words right outa my mouth dawg.

It's the picture of the 2008 box just to show the placement in the trunk. I changed the design in 2009 and 2010. In the same way you can't deny that 80% of the CRX boxes look familiar than to the others...

You can verify here:
http://www.termpro.com/asp/officialevent.asp?EventID=10353&Method=2

I'm now at home and I have 2009 and 2010 box pictures. It's more original for you Yuli? I don't stay with the same box more than 1 year.

But I don't know yet how to fix my problem. The box stay at his place with the aluminium parts but with the combine height, weight and smooth floor, it very unstable and the port toutch the amplifiers on the road

home depot or rona will have some like weather stripping in a roll which looks like tape. It will have adhesive on one side and sponge on the other. It worked great in my golf. Try it and see.

Thanks for your answer. I already have these weather stripping under my box but the real problem is the height versus the width of the box. To complicate the problem, the subs are heavy and on the top of the box. The box stay in place but it balance because the 1/8 floor is not enought stiff to support this weight and the port toutch the amplifiers on the road.

The only solution that I found is to do an entire new floor screw on the older like 3/8'' thick but I have to know before if its legal in Street and confirmed by a judge if its possible.

big bolts all the wall through the floor... you will gain

you got some nice scores, contrats