I had a super long list of everything, prices and if I regreted it or not. Pisses me off that it decides to fuq up then
Blue 93 Si
In order of purchase date (trying to anyways)
Front and rear alluminum strut bars, generic brand
Price: $50 each.
It's okay if you don't have money, but if you plan to get bette ones later, it's a waste. Get good ones from the start that actually work. These have pivoting ends that, I'm sure, allow too much movement to work properly.
Pioneer DEH P430. I think it's the 430, but may be the 330.
Price: $300 installed.
I love this CD player!!! This is my third Pioneer stereo. Two were stollen. That's how much I love it. There's so many adjustments you can do it's amazing. You can even power subs with it and it's decent if you can't afford a sub amp. Only regret is I could've had a better model for the same price at a different store. The one with the screen saver.
6.5 Polk Speakers
Price: $150 for 4. On sale from $200.
They are good speakers, but need an amp to sound good and they can handle a decent amount of power. I'm never satisfied with stereo equipment though so someday I'm going to upgrade to Boston Acoustics. Those speaker are awesome! I've had those in the past with no amp and I loved them. Good midrange for a 6.5".
Energy Suspension shifter bushings
Price: $15
LOVE THEM. Made shifting so much nicer. I don't know how to describe them...it just feels so precise. It's a bitch to install, but well worth it. You just have to smash them in and try to get them to stay in while you bolt it back up. Only took maybe 30 min to install.
16" Enkei RPO2's w/Dunlop SP sport W10's
Price: about $1200 installed with warrantee. Tires were maybe $110 each?
I originaly bought these for my sisters G20, but replacement tires were too espensive for her so she gave them back. Perfect offset too! Tires are great, but I have no other reference. Wheels looked good for a while, but after a year or so, it started to look like crap. My sister blew a tire in the front on the freeway from hitting something and she didn't lose control. Then she did it again on the FRONT and didn't lose control. Both tires were replaced for FREE under warrantee from America's Tire Company.
Slatertake
Price: $70?
Looks homemade. I should've took more time to make it look nice, but I wanted to finish it so bad. Sound is great and throttle response is improved as well as top end.
Magnaflow exhaust
A'pexi VTEC controller
Price: $300
Look on people face when they see it
Priceless. They always aske me what it is.
Installed myself and it was easy. Really cool cause I love electronics. I don't regret getting it, but it is pricey. I have it set up for better gas mileage. Doesn't do anything for a stock N/A engine.
Price: $100 installed
Looks ugly cause it's round instead of oval. Sound is awesome. Not loud at all until you floor it. It's on my sisters Teg right now cause I wanted to go back to totaly silent stock. I'll get an exhaust someday, but I want a premade one like Apex or Greddy.
Painted wheels
Price $5 per can of paint. Maybe 5-6 cans.
SOOOO not worth it. Looked good for a few days but started to look like crap after that. I first tried to clear cote it but it ate away at the paint so I had to paint it all over again. Waste of money and looooots of time.
Painted instrument cluster bezel.
Price: Leftover alluminum paint.
Looks ok, but under close inspection, looks homemade. You wouldn't believe how much it brightens up that area though. I put a stock one back it and it looked too plane, so I switched again. Save your money and get a real alluminum one off of ebay that doesn't have dust stuck to the paint like mine does.
4 chanel Alpine Amp
Price: $350 installed
Great amp, works well with my speakers. I can't remember the wattage though. Maybe 40 by 4?
Tokico full coiover suspension.
$750
Installed myself. Don't regret it. Love it. Ride is so nice and smooth. I'd say it's close to stock on level 2 front, 1 rear. Progressive spring rates front and back make it ride so nice, but turn up the notch a few clicks and steering response is amazing. I've had Skunk 2's and illuminas on my other car and it was way too harsh. I swear I was an inch taller before that suspension set-up

.
Tinted windows
Price: $35-$45
Removed all windows and did it myself. Looks great at 20% all around but wish back was a little darker. I thought 20% would be darker than this, but it's still really easy to see inside the car. I would use higher quality tint next time. This one seems to scratch too easily. Front corner windows were a BITCH to get it to stick cause it's plastic and curved so much. Back window is flawless and looks profesional since the glass is flat.
there may be more, but I can't think of it right now.