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  1. 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...
  2. 2.5 Liter/Litre Factory Motor
    Looking for some advice on a 2015 Stock WRX STi. It has been a daily driver and as such I have just never gotten around to any modifications. Today I took the car through a car wash and immediately noted drastic power loss after leaving the car wash. There were no notable sounds around the...
  3. General Subaru Discussions
    I have a 2020 STI with about 38K on it. Ive had it for little over a year now. I recently had the CAT replaced due to a crack in the internal monolith. I have a BOV and MAF axlebacks on it. I put a perrin cold air intake on it, drove it for about a week and started to hear this terrible sound...
  4. 2.5 Liter/Litre Factory Motor
    Hi, has anyone has installed the Blouch Dominator 2.5 G2-R, or driven in an STI with one installed? I'm interested to know any thoughts about it. My mechanic/tuner used to recommend the Dominator 1.5 XT-R as an upgrade from the stock turbo, but more recently changed to recommending the 2.5...
  5. 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...
  6. General Subaru Discussions
    Just to get straight into it recently purchased a 2014 Subaru Wrx Hatch. I know it’s an Sti forum I do own a 2018 please don’t get upset for the question. The 2014 sitting at 80 thousand miles with service records from the dealership purchased 13 days ago is now starting to have a very strange...
  7. Engine/Drivetrain/Performance Parts For Sale
    Selling my used EFR 7163. The hotside and internal wastegate are BRAND NEW, however the cold side and turbine wheel are used. The turbo needs some re-assembly, and possibly some new parts. These pieces are left over, as bought a new turbo, instead of re-building this one. Open to offers...
    $400 USD
  8. 2.5 Liter/Litre Factory Motor
    I’ve got a ‘19 STI, currently bone stock from factory, and have been getting a seemingly abnormal sound under full boost. Just got it back from the shop to attempt and fix the problem. They did the following: Checked for leaks in intake, but found nothing. Tore out the turbo and claimed there...
  9. Built Motor Discussion
    Apologies if this is the wrong sub. I’ve got a 2011 STI that I’m building and I’m looking at turbos that fit the bill, right now I’m looking at a TD06SL2 60-1 from Kinugawa that they rate for 450-500whp. The plan is to track the car in CSCS but it’s mostly a daily driver. Turbo specs are...
  10. Built Motor Discussion
    I have a 2012 Subaru sti with a Tomioka 3076R turbo and my car has been running great until I noticed it was only hitting 13-14 psi of boost, tuned for 22psi the car has no boost leaks holds 20psi of air and smoke tested, all vacuum lines have tested and have no leaks, bypass valve is sealing...
  11. Built Motor Discussion
    Hi there, Does anyone at all have any experience with this new turbo ? I know lots of people trust Grimmspeed and based on their description, this turbo is really capable AT A STOCK LOCATION ! - Id like to hear some feedback, experiences, and builds in general involving this new Grimmspeed...
  12. GD-General
    So i have had a problem for a year where i have lost oil consistently at a rate of about 1qt/500 miles. I have not found anything to leak, there is no smoke out the exhaust or excessive pressure from under oil cap when the car is running. I just recently made the car (03 gdb sti with ej207) a...
  13. General Subaru Discussions
    Hello, I own a 2007 Subaru Impreza WRX TR. First time owning a turbo car but not a Subaru since I also own a 2001 Subaru Impreza RS. I’m familiar with the basics but not the turbo. The car is not stock as it comes with a front mount intercooler, a Turbo XS manual boost controller, HKS blowoff...
  14. Engine/Drivetrain/Performance Parts For Sale
    I have several sti parts for sale off a 2006 STI I have a rotomaster turbocharger with around 25K miles on it and yellow side feed sti injectors I also have the 2006 sti top mount and sti y pipe and sti up pipe and as far as fitment goes all these fit 02-07 wrx and Sti's as far as I know just...
  15. GD-General
    Never owned an sti before, or even a subaru, I was wondering if they came stock with a blow off valve and if they do, what do they sound like? A friend of mine has a turbo on his car and he blocked off his blow off valve to get that stutututu sound that everybody is in love with (or at least I...
  16. Built Motor Discussion
    Hey guys. I have a 2018 STI that I’ve Been working on for about 2 years and here is my current Engine mod list. Cobb intake Cobb accessport Nameless turbo back exhaust AEM high flow fuel pump Cobb flex fuel sensor kit Cobb fuel rails Cobb 1050 injectors Flex fuel tune 333WHP/360T Just...
  17. Engine/Drivetrain/Performance Parts For Sale
    I have an Fp Blue for sale in Colorado Springs, Co, I'm going to upgrade to an Fp Black. My loss your gain Purchased last year About 8k miles Turbine is coated Ported External waste gate Will also include tomei inlet for free (purchased in March 2020 and has about 700 miles) Off a 2016 sti No in...
  18. 2.5 Liter/Litre Factory Motor
    I have a 2013 Impreza STI, it rained a lot yesterday and some water got into my car. I left to work early in the morning and the water was about ankle level on the passengers side. When i would drive i could hear the waves going back and forth. I had no idea there where sensors by the passengers...
  19. GD-General
    Hi is hoping y'all could ease my mind, I have an Fp Blue turbo with 58mm stock housing, (about 10 months old) on a 2016 wrx sti, I noticed a smell of burnt oil and when I diagnosed the issue I noticed the vaccuum hose that goes from electronic boost control solenoid to compressor hosing was...
  20. Engine/Drivetrain/Performance Parts For Sale
    Hello to all, I have for sale the Killer Bee Holly Header, Coated and Turbo from Forced Performance (FP) Blue Coated with internal Wastegate and Ported Turbine housing They belonged to Subaru STI MY17. I am located in Miami Florida. as you can see from my other for sale Thread all the parts...
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