I was not happy with the way most knock sensor indicators worked. They really don't give much information. So I decided to do something different and wire the knock sensor up so I could hear it over the car's stereo. The idea behind it is simple the knock sensor is a piezoelectric device that generates a small electrical current when it is vibrated. Pretty much the same as a microphone but able to withstand temperatures much better than a standard mic.
I started by removing the rear seat, rear seatbelts, all rear plastic parts, soundproofing from the carpet, and tar soundproofing. I then used thin automotive carpet and spray adhesive to glue the carpet over the bare metal. The carpet is very light and the total weight of the carpet and glue is not even one pound. The improvement to the look of the interior over the bare metal is definately worth the extra weight. The car is also much quieter with the carpet compared to bare metal. These pictures show the interior without the front seats but I put the stock front seats back in for now. I left the mounting hooks for the seat back in place, I can lay the seat bottom in place and hook the seat back on those hooks in case I want to take more than one person somewhere.
The Front bumper has been modified by filling in most of the grille, adding an air dam, and by sealing the gasp at the hood. The less air going into the car or under it the better your aerodynamics. The radiator really doesn't need that much air but if your car gets warmer than normal then you might want to slightly open up the opening for the radiator till it gets back to normal.
I am listing all the mods done to the car while it was still a hatchback. Some of the modifications have linked pages showing more detail but a lot of these mods don't need much of an explanation. This list was my basic starting point…