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Tomei ARMS M8265 Turbo ( Part Number:TOM 173024)

Tomei ARMS M8265 Turbo - Subaru Models (inc. 2002-2007 WRX / 2004+ STI)

MODEL # TOM 173024
Manufacturer Part # 173024


MSRP: $1,490.00

In stock! Ships same day
Qualifies for free shipping!


This turbo has the potential to deliver 450PS with the stock layout; from 4000RPM upwards is where peak power comes in. This Turbo's special characteristics will really show when added engine tuning and internal upgrades are done.

Includes: Turbo, Water Lines, Oil Return Lines. Gaskets, and Bolts.

Compressor Wheel: 52 Trim, 54.8mm Inlet Diameter, 76.2mm Exit Diameter
Turbine Wheel: 77.1 Trim, 67.0mm Inlet Diameter, 58.8mm Exit Diameter.

A silicone inlet hose is needed when using this turbo as the inlet is slightly larger than stock.
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Brand: Tomei
Bearing Type: Journal Bearing
Cartridge: Tomei
Fitment: OEM Upgrade
Gaskets Included: Yes
Inlet Size: Non OEM
Oil Line Included: No
Ported Turbine Housing: No
Rated Horsepower: 450hp
Scroll: Single
Wastegate: Internal

Mfgr. Warranty: 1 Year
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



Verified Purchase

Dyno tune/street tune
IG: @dustyboi808 25 days ago
So after having this turbo installed for about 2years, I haven’t gotten the chance to boost the car because I was untuned the whole time. I finally got tuned and here is what I got. On the dyno we discovered that my EBCS (turbosmart e-boost street) was seized after not boosting for couple years. We could only push it at max boost 16psi results: 355whp 338tq. Now as stated in the title, I picked up a Hallman manual and installed that the same night, went out on the street with my tuner and pushed it up to 21psi, we didn’t get a direct number on the street but DrunkMan laughed and guaranteed it is now over 400whp for sure. I noticed that RallySportDirect *HPrating* is at the crank (450hp) so roughly 350-360whp. But with supporting mods: 850cc injectors, deatchwerks 300 320lph fuel pump, agency power EL headers, Invidia turbo back, Perrin cold air Big Maf intake, Perrin 3” silicone inlet, cosworth head studs, 100mm Pistons, eagle rods, ACL race rod/main bearings, Spearco TMIC, exedy pressure plate, ACT 6puck disc, and as well as methanol this turbo can surpass 400whp. Over all this turbo is still a bit “punchy” as it is not a really big turbo it does not have a completely horrible boost lag. Full boost comes on at about 3700-3800 not at 4K light it is stated on the Tomei website. I’m sure others with bigger supporting mods and maybe higher boost are pushing it waaay pass 400whp
Verified Purchase

Tomei always provides
SW 808 3 months ago
Beautiful turbo and quick and easy install. I have this on my EJ207 V7 w/ the Tomei headers, Up-pipe and cat back exhaust along with DW 1000cc injectors and the ETS FMIC. Without hesitation the car put down 425hp/385tq on 25lbs consistently and we took it much much higher. Keep in mind the power band is higher more of a higher mid/top end range. Being i have the FMIC i do get a tad bit of lag pending driving condition, however when this turbo starts to spool you will know and for sure hear it. Definitely would recommend but as always, check with your tuner first! Haha
Verified Purchase

best turbo on the market!
tanvir dhaliwal 2 years ago
Fits better then the stock turbo! Installing was very easy, everything fits so perfectly and sounds like a beast! Made very good numbers and highly recommend.

very pretty and good turbo
ryanlholbrook76760 3 years ago
Got this when my vf22 seized up. This is one good looking turbo for sure. Very happy with my results. I uploaded a dyno chart from my auto 04 fxt. 316whp 286wtq @ 18psi
Verified Purchase

AMAZING (also proud to be the first reviewer)
Devon4390 4 years ago
i recently asked RSD what i needed to support this turbo, well, they told me what i needed, so i bought it and of course the pump, and injectors. but, decided id change some things up a bit. I already had an invidia divorced wastegate catted downpipe, and the cobb sf intake. i also decided to go with a perrin fmic and turbo inlet, and a grimspeed uppipe. SUPER EXCITED to announce to everyone, this turbo fits EVERYTHING i bought. the intercooler piping ran to the turbo like a glove. the turbo inlet wasnt specified to fit, but, it absolutely works perfect. the uppipe bolted up with ease, no pulling or crazy prying on parts to get it on. and also looks super great with the shiny blue wastegate actuator. and most impressed by the sound this thing puts out. it starts whistling at a mere 2300rpm! sounds like a CAT turbo diesel turbo spooling up. ahh. love it. I ran some injector dynamics 1000cc injectors, and a walbro fuel pump. get this turbo. its also super fun to install by urself.

  • Q: Camshaft  Challeen42 4 months ago


    Would this work well with Brian Crower stage two 272 cams?

    • A: Yes those cams will compliment this turbo nicely.

      Tyler A. 4 months ago
  • Q: Turbo  ArthurH 8 months ago


    Could I run this turbo with a stock motor? I planned on building a motor later on and just wanted to have this as a part for now to get some horsepower out of it as I could. Or would you recommend buying a smaller Tomei turbo with a lower powerband due to running it with a stock motor?

    • A: You can run this turbo on a stock motor, but would require at least upgraded fueling, and exhaust to support the turbo. Also, please note that any aftermarket turbo will require a new tune.

      Brady R 8 months ago
  • Q:   Leo01 1 year ago


    Do I need a certain type of downpipe by that I mean the bellmouth, split bellmouth or divorced ?

    • A: You can run any type of downpipe you would like bellmouth or divorced. I would recommend not using the OEM downpipe though.

      Ben L. 1 year ago
  • Q: Bolts  ShadowGroup24 2 years ago


    Do i need to purchase the bolts to connect the downpipe?

    • A: Yes, the downpipe bolts are not included and will need to be purchased separately.

      Brady R 2 years ago
  • Q: 2011 sti tomei turbo   2011sti 2 years ago


    What are the would i have to do for internals would i need to use full power off this tubro But just piston and rods be fine or it wont last long... What do i need to run this turbo safe and hard?

    • A: A fully built motor, supporting fuel system, and a good tune are recommended for using this turbo.

      Chris W. 2 years ago