

This is my car, it is a 1991 Volvo 940 SE Turbo Wagon. It has 238,000 Miles and counting.
What i have done to it:
JVC KD-G511 Head Unit
Jl Audio TR650-CX
What i want to do:
Tint all the windows
Subs
Rims
WHAT SHOULD I DO TO IT?
HOW DO I INSTALL SUBS IN THE SPARE TIRE BAY?