Mechanically, I've put my own stainless steel muffler on (after running a straight pipe for a while), with a custom hanging system, changed air filter to a cone one, replaced plug wires, bypassed the idle air control valve and set up a manual idle control system inside the cabin, added a fuel injector kill switch (I've yet to calculate mileage gains), and changed lots of little ends here and there electrically, like the clutch switch bypass (stupidest safety feature - designed so you don't start the car in gear, but tell me what happens when you get used to starting the car with the clutch depressed, then letting it up right away - SAME ISSUE, the car flying forwards ... duhhhh), DRL disabled and jumpered so my high beams still work, hmm ... I'm sure I'm forgetting a lot.Cosmetically, the car has my custom painted steel rims, self-done gold striping, I painted the strip of trim above the doors and windows to be black, painted the interior psychedelically, and I suppose that's all I can remember at this time. Let me know what you think! It's cool, because the car is a growing process for me. On the second muffler, second set of striping, second interior paint theme, and with all this, it's around 197,000 miles as we speak. Love it.