AEM- Single pipe intake with MAF near wheel (thats a bad thing) $240.
Injen- 2 pipes (you can convert from CAI to SRI), MAF near TB $226
Fujita- Same as Injen ^^ $269
CP-E- Base model tunes your (a/f) car slightly, tuneable version for $100 more. Not recommended for the 6i. $490/$590
Bomz- Ebay intake modeled after Injen. Filter is low quality, suggested you replace with AEM, or Fujita filter. $50
*Note- All these intakes will give the same gains. You can expect to see anywhere from 5-7whp. Check out therpmstore.com
Magnaflow cat-back- The most popular CB for the 6i, special pricing though therpmstore.com
Racing Beat- Axle-back exhaust (so pretty much 2 mufflers) $419
Custom- If you plan to go boost, i would suggest going 2.5" madrel bent with the muffler of your choice $300-500
*Note- Exhaust's will not give you a HP gain, IT IS purely for sound.
F2- 4-1 header with flex-pipe and high flow cat/race-pipe option. Peak gains of 8-10whp $375/$475 f2usa.com
*Note- Should have upgraded exhaust system with this.
Twowheelin's (Cordovamotorsports.com) TB- $200 after core-refund.
*Note- These are 'factory new' Mazda throttle bodies that are fully optimized and polished to provide over 15% more air flow area than the stock unit! This increased air flow results in dyno proven increases in HP and torque for better throttle response you can feel across the entire rev range. These throttle bodies are not only larger in area, but also provide a smoother air flow for reduced intake turbulence using the following optimization techniques:
Dyno Comparison - Mazda 6i (2.3L) Throttle Bodies
RunFile_001-Stock 60mm Throttle Body (HP=135.05 Torque=130.98)
RunFile_004-Optimized 64mm Throttle Body (HP=139.52 Torque=134.03) +4.47HP +3.05TQ
RunFile_003-Optimized 60mm Throttle Body (HP=139.08 Torque=135.82) +4.03HP +4.84TQ
Short throw shifters
TWM- Reduces throw by 35%, and also has a 2.5" height reduction. $150 twmperformance.com
MS STS- Stock hieght (yay) and reduces throw by 35% $156 ( http://www.buymazdaparts.com/parts.c...de=MZ6&catid=7
*Note- For MTX only... uhh ya.
Balance shaft delete
F2- This kit is for the 2.3L duratec platform and will free up excessive rotational drag by removing the balance shaft. Includes all necessary hardware needed to block the oil feed line in the 2.3L Duratec engine. $20 from f2usa.com
*Note- This install is not for the faint of heart. Essentially your taking out a 20 lb. hunk of rotating mass from the engine.
Cosworth- $695 Cosworth Intake Manifold for 2.3l Duratec Ford Focus
*Note- Good luck finding one!
AWR- Transmission mount $90 This allows you to put more power to the ground.
AWR- Passenger side mount $160 " " thepmstore.com
V2- Lower engine mount $130 " " F2usa.com
*Note- Expect ALOT of vibration/sound in cabin.
Advanced timing mod
Timing advance mod - Mazda 6 Forums : Mazda 6 / Mazda Atenza Forum
*Note- You "should" use 89/91 octane with this mod.
*Note- Your removing "flappers" from the intake manifold, which allows more airflow.
Hiboost- 225whp with stock exhaust, 25pwhp with 2.5" exhaust. $4k hiboost.com
F2- Stage 1 is $3k, stage 2 dyno/price TBA. f2usa.com
Custom- ONLY go this route if your doing the install yourself, and can get the key components (MS6 turbo/manifold, intercooler, tuning, etc...) for a good price.
*Note- I would strongly recommend saving up for a turbo kit. Once you get the mod bug, you WILL want more power and NA just wont cut it (and if you can make it work for you, i can gaurantee you will spend double what you will need for a kit/install/tuning.
O.K. now obviously there are other little things we can do to our car (TB coolant bypass, ground wires, etc...), but this list will net you actual WHP. I also didnt list EVERY lil' brand (GT spec header, or Greddy/Evo exhaust) becuase they either 1. are over-priced, or 2. dont fit correctly.
pleast notify a mod if you feel there is something that should me added to the list