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  1. 2015+ STI Discussion
    New to the forum and would like some advice for going stage 2. Im unfortunately in Cali and these regulations are not pleasant. I've done some readings and have talked to Drunkman(anthony) and he said that even with the new GESi downpipes, theirs a chance that CEL codes will pop up. I don't...
  2. ECU Tuning & Performance Electronics
    I have a 2019 sti with 40k miles on it, I recently installed the Cobb redline intake and used the 93 sf v400 boostcontrol map because I believe that’s the right one. It won’t make over 10psi of boost now and it doesn’t sound very good. Everything was installed correctly with the Cobb...
  3. 2015+ STI Discussion
    Im going completely cat less on my car (17’ STI) and open source tune of course but I’m worried about boost creep, especially since I live in a place where the weather and climate is so bi polar. I read online that the only good way to control boost creep is through an EWG set up, I’ve found all...
  4. General Subaru Discussions
    Hello I bought a 2015 Sti not that long ago and I’m needing to replace the headers due to a stripped 02 sensor. I’ve done my own research and concluded I want unequal length headers but can’t find a brand I want to use since some brands use a different type of metal that people say is not “heat...
  5. 2015+ Member Journals
    Hi All, I hope this will be an ongoing adventure in modding my STI. "Magnus Rufus", Latin for "Big Red", is my new project. My intentions are to improve the looks, handling and power of this car. However, reliability will be my primary concern. The car now resides in Tucson, AZ. Other than...
  6. 2015+ STI Discussion
    Hello everyone! Here are the upgrades I've done so far: Killer B ELH with up pipe Grimspeed Stealth intake Invidia downpipe IAG AOS 3 port EBS Cylinder 4 cooling mod. Invidia R400 turbo back exhaust ECUTEK Rom Oil pressure, oil temp, wideband AFR gauges Went on a dyno after the work few weeks...
  7. 2.5 Liter/Litre Factory Motor
    Hey first post and in need of help. Brand new core block installed Engine Cranks strong and seems to almost start (sometimes it seems like it wants to kick over.) NO CEL OR CODES The engine is mostly all stock besides: -Cold air intake -Full Invidia exhaust -COBB access port V2 I have fuel...
  8. General Subaru Discussions
    Does somebody has the Maperformance stage 2 OTS tune for a sti 2019 I want to buy the DP and the intake but they no longer provide the OTS tune, I know I know OTS tunes are trash and the whole history I just dont have the time to get it pro tune or e tune because work right now, plus no pro...
  9. GR-General
    Hey guys and gals, Newer to the subie fam and hoping for some help... I have an 09 STI hatch and I'm experiencing the "stumble" Looming for suggestions on what brand of Fuel Pressure Regulator and air oil separator is best. Right now I'm looking at Cobb, IAG, or Radium. I'm trying not to...
  10. Exterior Parts For Sale
    Aeroflow Dynamics V4 Splitter, taken off my GR STi. This splitter is designed to be mounted under the CS1 style front lip but can also be mounted with no lip as well. Includes all hardware and the mounting spacers intended for the CS1 lip. If you want to mount it to a different lip or no lip...
    $275 USD
  11. General Subaru Discussions
    I've been having an issue with both exhaust side AVCS solenoids having a small oil leak and after replacing the gaskets they still seems to be leaking. I was told by Subaru they don't sell replacement O-rings for the solenoids just the entire assembly which are working so rather than dropping a...
  12. 2.5 Liter/Litre Factory Motor
    I was driving home today and smelled an odd smell then when I was at a red light I noticed white smoke coming out of my hood. I drove it home (slowly, I was not far from home and didn’t want to leave myself stranded) to look at it only to see it spraying coolant in between the overflow tank and...
  13. General Subaru Discussions
    Hey guys really hope someone knows what’s going on 🥲 Mod list (close to stock): -Cobb diverter valve -Cobb cold air intake -Perrin turbo inlet -Tomeii catback exhaust -Stage 1 tune from Cobb AP I have a 2005 Subaru STI but have been having some intermittent boost problems for a couple of...
  14. Car Classifieds
    I'm pleased to offer this single-owner, tastefully modified Impreza WRX STi Hatchback for sale on behalf of my friend, who's asked me to represent him, with a clean CA title. The vehicle is available for viewing near the USC campus, with test drives available with proof of funds in hand. PPIs...
    $24,000 USD
  15. Northeast Subaru Classifieds
    Running pull from a bone stock 2015 Subaru STI with 160,000 miles. Cylinders 1 and 3 compression down to 90psi. Was losing half a quart every two weeks. I decided to install an RA shortblock and new heads so I don't need this taking up space in my garage now. This is a great set for a rebuild or...
  16. Used STIs For Sale
    The time has come. I bought this one to replace my 04 hatch that the dealer damaged and had to buy from me. It was more than I wanted to spend, but I couldn't find a good condition GD hatch that was not overpriced. Only reason I am selling is I am looking to move to an EV for a daily as my...
    $20,000 USD
  17. FAQ/Newbie Forum
    Hi I’m new to Subarus, I got my first 2013 sti not to long ago I haven’t done much to it just stage 1 with Cobb, but I wanna get more power I’m thinking of upgrading the turbo any recommendations on what route I should go? I was thinking the Cobb 20G turbo , will I need to upgrade my fuel system...
  18. ECU Tuning & Performance Electronics
    I'm looking into getting a fresh tune for my car however I no longer have the parts to make it emissions friendly (previous owner deleted air pump), I'm planning to go catless/tgv delete for track duty and the car was previously tuned on an Accessport. I know Tactrix/RomRaider are an option but...
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