Everything was measured to the tenth of an inch. spacers were needed for the front not not in the rear. They did 3/8th inch spacer and some more I think to make sure the speakers don't sit too back from the panels. Their reasoning they did not want the sound to get lost inside the panel. They wanted the maximum output. Everything has been tested, no issue with inside the door with the glass or outside with the panels. They work on cars that cost ten times more than mine and have been in business for 32 years. They have solid reputation in DFW area. All the Dallas Cowboys, Stars and Mavs visit that store for their rides.
The finished product is just a factory look, you cannot tell there is anything in there as everything is hidden. The only thing you can see is the sub-woofer in the trunk, I will take a picture of it and put it here.
Hi am just seeing this post. Sorry if this reply is too late. But you do not need a Bit ONe. For our set up Bit ten would be just fine.
It is really not necessary. I did all the dynamat because I did not want any vibrations and rattles from the subwoofer. The doors help with the road noise. The tires we get on the cars are not very good even though I did not get hankooked.
There is no effect on the mileage. I get the same mileage as everyone else reporting here. I have gotten mileage any where between 42 mpg to 57 mpg depending on the highway or city driving, traffic, speeds, weather, distance etc. I have gotten car as fast as 105 mph and it drives great.
