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This is a discussion on STi Modification Path within the STi Technical Forum forums, part of the Tech & Modifying & General Repairs category; I have a stock black 06 STI and I am starting to wonder about mods. I, unfortunately, don't know much ...

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    Thumbs up STi Modification Path

    I have a stock black 06 STI and I am starting to wonder about mods. I, unfortunately, don't know much about working on cars (although I could talk about them all day) so I probably won't be able to do much of the work myself (not many tools, no garage, and lack of knowledge). But I do have some friends that may be able to hook me up. Anyways, I am wondering if I were to spend ~2k on mods (parts), what would be the first things to do to it? I guess you could think of this as a challenge to you gurus.

    I have read a lot of the posts in here but a lot of them are beyond my technical knowledge so they are quite confusing (damn acronyms). I am still not fond of voiding my warranty, so if that can be avoided then awesome. Otherwise I guess I'll have to wait 3 years.

    So basically, if you all had ~2k to spend on mods for an 06 STI, what would you do to it? (and please, avoid acronyms if possible since I am a technical idiot) I would really like to get rid of some of that turbo lag specifically, but whatever you guys think.

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    Moderator YBNormal07's Avatar
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    Stage 1:
    EMS or Exhaust. EMS to consist of piggyback or flash type unit. Exhaust to consist of full TBE, or just DP, or just CB. (read stickey on acronym's if these are confusing).
    $350-1100.
    Good for 10 (TBE) to 30 (EMS) HP to the wheels.
    Durability not an issue.

    For 06 STi: Replace OEM motor mounts with 04/05 mounts if you have the easy to break liquid filled mounts.

    Stage 2:
    EMS (off the shelf maps) + TBE
    $1100-2000
    Good for 30-60 to the wheels, depending upon tune, location, system, octane, and environemnt.
    Durability not an issue

    Stage 2.5
    Same as above with pro-tune. Good for another 10-20 HP. More aggressive AFR's though, so be carefull.

    Stage 3:
    Stage 2 mods
    Same as above plus:
    Upgraded turbo and supporting mods, including fuel pump, injectors TMIC or FMIC, BOV if FMIC, EWG if rotated turbo. Also consider race type radiator, HP Radator cap, water and/or methanol injection, nitrous, headers for reduced EGTs, and upgraded fluids. Pro-tune is a necissity unless untill a company comes out with off the shelf maps for upgraded turbos on an STi application.
    $-use your imagination. Easily over 3K.
    Good for 350-400 HP to the wheels depending on configuration and aggressiveness of tune. Many common applications are now available that consistently put out 350-370 to the wheels.
    Durability not totally known, but some applications are exceeding 30K miles on upgraded turbo setups.

    Stage 4:
    Same as above plus:
    Built short block
    Built long block if you have the cash.
    Intake
    Intake manifold ported
    Upgraded clutch
    $-Dependant upon level of build.
    Good for upwards of 400 HP to the wheels, with current known application putting out +500 HP to the wheels. Durability is not known at this point, as the folks that spend this type of money don't advertise how much it cost, and usually don't always own up to breakage.

    Non-engine related upgrades include, from less expensive to most expensive: shifter bushings, strut bushings, anti-lift bushings, short shifter, SS brake lines, Performance brake pads, undercarriage aero parts, springs, struts, camber kits, adjustable struts, tires and wheels. Of these, I recommend the following order: Brakes, tires, shifter, suspension, wheels.

    This does not address Boost creep, CELs, warranty or any other potential issues you may have to deal with in your upgrade path. Using logic, you can easily see that regardless of your upgrade path, EMS and exhaust are two basics that always hold true.

    If I omitted something or made a glaring error, which I've been known to do, or if you want additonal categories in here let me know. I basically have included the Stage, the parts, the cost, the HP gaines, and the durability...all based on my own limited knowledge.

    Let me know if you want this to be a stickey. If I make it a stickey, I'll retitle it and delete non-applicable or OT posts as they occur. Feedback is not only welcome, it is probably needed

    EDIT: As a benefit to those who are going after some good numbers on the dyno or at the track, and don't wish to use pure 110 race gas every time, here is a link to a locater for your nearest Sunoco station selling Sunoco 260 GT100, which is a 100 octane unleaded fuel right out of the pump, and no where near as expensive as 110.
    http://www.sunocoinc.com/site/Consum...T100Locations/

    Cheers,
    Scott
    Last edited by YBNormal07; 04-12-2007 at 06:32 AM.
    tEh PriUs=teH faSTah!@@!
    08 Audi S5 Black Diamond edition
    SOLD: 05 SWP Legacy GT Limited 5MT, 13.3ish@105 (stage 2) crappy stock clutch
    SOLD: 04 MPS/SW WRX Sti. 12.971 @ 103.97 (stock)
    278 AWHP/283 AWT, Catback exhaust
    306 AWHP/341 AWT, Stage 2
    (Scott) Moderator-STi, Drag Racing, Car Purchasing, and Tutorial Forums

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    Registered User Jon @ Kinesis's Avatar
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    Thanks Scott, definitely a solid run down of everything.

    Most of that goes along with what I thought and expected. As for the very specifics, I am sure that you are going to see differences in HP gains based on each individual product, as well as differences which arise from vehicle to vehicle.

    Jon
    Jonathan Edwards - Kinesis Motorsports

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    Wow thanks a lot, that really helps. I've decided to go Stage 2 COBB with TurboXS Turbo-back system. Looks like anything else will start to get in the REALLY pricey range. Of course now I have to decide whether or not it's worth it to me to void the warranty. I guess some people think it's basically worthless anyways? Oh yeah, and the small matter of VA legality and money...

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    Moderator YBNormal07's Avatar
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    I just took my stage 2 legacy in for service, followed by inspection. No problems at all. Kept the stage 2 map in place too. I love OBDII testing!!!!!
    tEh PriUs=teH faSTah!@@!
    08 Audi S5 Black Diamond edition
    SOLD: 05 SWP Legacy GT Limited 5MT, 13.3ish@105 (stage 2) crappy stock clutch
    SOLD: 04 MPS/SW WRX Sti. 12.971 @ 103.97 (stock)
    278 AWHP/283 AWT, Catback exhaust
    306 AWHP/341 AWT, Stage 2
    (Scott) Moderator-STi, Drag Racing, Car Purchasing, and Tutorial Forums

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    dude, yb....make this a sticky....although you might not want too...ill lose all my post points in the future of never getting to tell the newbs how to mod their sti! ;D !!!!!

  8. #7
    Registered User tayhadar1's Avatar
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    Quote Originally Posted by 06blacksti
    Wow thanks a lot, that really helps. I've decided to go Stage 2 COBB with TurboXS Turbo-back system. Looks like anything else will start to get in the REALLY pricey range. Of course now I have to decide whether or not it's worth it to me to void the warranty. I guess some people think it's basically worthless anyways? Oh yeah, and the small matter of VA legality and money...
    Yeah if I were in your shoes that is probably what I would do. To me stage 2 just seems like the safest way to mod and not really lose reliability of the engine.
    2004 WRX Sti Cobb Stage 2
    GO COUGS!!!

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    i just came back from subaru of jacksonville....took my first STi for a ride and LOVED IT....

    they are telling me that the 07's will be on the lot in 2 weeks......

    they also said that the dealership is MOD FRIENDLY.....in fact, the salesman that rode with me has a 06 STi with ECU and exhaust work done....




    so, now to be clear:

    stage 1 is turbo back exhaust OR reflash

    stage 2 is TBE + reflash?



    and stage 2 SHOULD get you 300 to the wheels...correct?

  10. #9
    Moderator YBNormal07's Avatar
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    Yep...except Stage 2 is TBE + EMS (reflash, OBDII map flash, Piggyback map, etc.) Not necessarily just a reflash.
    tEh PriUs=teH faSTah!@@!
    08 Audi S5 Black Diamond edition
    SOLD: 05 SWP Legacy GT Limited 5MT, 13.3ish@105 (stage 2) crappy stock clutch
    SOLD: 04 MPS/SW WRX Sti. 12.971 @ 103.97 (stock)
    278 AWHP/283 AWT, Catback exhaust
    306 AWHP/341 AWT, Stage 2
    (Scott) Moderator-STi, Drag Racing, Car Purchasing, and Tutorial Forums

  11. #10
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    and at what point do you have to have it shop tuned.....

    im guessing NOT with just TBE...........

  12. #11
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    stage 3....turbo upgrade requires shop tuning in most cases...some turbos have universal maps from cobb but...its best to get a turbo protuned since you just spent 1.5k...might as well get all the power you can out of it. Anytime you mess around with the turbo, fuel, re-doing the piping for a front mount, CAI, internal work...its necessary to get a shop tune.

  13. #12
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    so TBE with accessport and all is good, right?

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    Quote Originally Posted by Idok
    i just came back from subaru of jacksonville....took my first STi for a ride and LOVED IT....

    they are telling me that the 07's will be on the lot in 2 weeks......

    they also said that the dealership is MOD FRIENDLY.....in fact, the salesman that rode with me has a 06 STi with ECU and exhaust work done....




    so, now to be clear:

    stage 1 is turbo back exhaust OR reflash

    stage 2 is TBE + reflash?



    and stage 2 SHOULD get you 300 to the wheels...correct?
    Just got a mail from Subaru the other day indicating that changing the intake & exhaust, you are good for additional 45hp. The best part, it's still under warranty. I priced it out, and it'll run around $850.

  15. #14
    Moderator YBNormal07's Avatar
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    Quote Originally Posted by flu_subaru
    Just got a mail from Subaru the other day indicating that changing the intake & exhaust, you are good for additional 45hp. The best part, it's still under warranty. I priced it out, and it'll run around $850.
    Read the fine print. There is always a disclaimer on anything that increases power to the engine or will put more torque on the drivetrain or suspension. It usually reads like:

    Sold "as is" without any warranty coverage. Intended for off-highway application only. May bring vehicle out of compliance with safety/or emissions standars. Can only be lawfully installed by end user. See dealer for complete details
    tEh PriUs=teH faSTah!@@!
    08 Audi S5 Black Diamond edition
    SOLD: 05 SWP Legacy GT Limited 5MT, 13.3ish@105 (stage 2) crappy stock clutch
    SOLD: 04 MPS/SW WRX Sti. 12.971 @ 103.97 (stock)
    278 AWHP/283 AWT, Catback exhaust
    306 AWHP/341 AWT, Stage 2
    (Scott) Moderator-STi, Drag Racing, Car Purchasing, and Tutorial Forums

  16. #15
    Registered User rr1911's Avatar
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    Quote Originally Posted by YBNormal07
    Read the fine print. There is always a disclaimer on anything that increases power to the engine or will put more torque on the drivetrain or suspension. It usually reads like:

    Sold "as is" without any warranty coverage. Intended for off-highway application only. May bring vehicle out of compliance with safety/or emissions standars. Can only be lawfully installed by end user. See dealer for complete details
    + 1 heard that many of times !

    TBE, AP and some springs and you should be good for a whileand under 2k !
    P.S. Dont forget to get a good radar detector like the valentine 1 or Escort x50 !

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