Cheap mods (under $100)

***Flaming Disclaimer!! All prices are either guestimates are what I've paid. You can find better deals if you search or have patience.

AFE Drop in Filter - $50
Drilling holes in Filter cone - priceless!
New spark plugs - $40 (Either motorcraft or NGK)
Mobil-1 - $30 (for 5.5 quarts...and I know I felt a difference!)
New plug wires - $50 (see post in GB section)
Synthetic Tranny fluid - (Mobil-1)
Replace Brake fluid - (Big bottle Syntec from AZ)
Brake pads - (A matching set all around...nice and even performance/wear. Stazi's were $87 for F/R to my door. Perform a little better than stock, and hardly any dust!)
1 bottle electronic parts cleaner - $5 (pull your MAF and gently spray/clean it)
Replace stock resonator - $80 ($40-50 for a Mag or Edelbrock, and $30 for install. Not sure about HP...maybe 1-2, but love the sound!)
4 wheel alignment - $60 (can you say no more dog-tracking?)
Remove the ding guards - Also priceless
Bnoon TB Optimization - $60 ($169 total, but he refunds $100 when he recieves your TB...3 HP)
Poly sway bar bushings - $20 (for F/R...I'll do your fronts...HAHAHAHAHHAHAHHA!)
Braided Brake lines - $100 (F/R if you don't count shipping!)

I put this list together for New CSVT owners. Yes, you can optimize the stock Y-pipe, pull the UIM and LIM and clean them, do some gasket/port matching, get a used Pro-M, etc...but I felt the above list was something anyone could do in their driveway, with minimal skills, and feel solid results.

Please feel free to add to the list.