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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

not to shabby
striker775 14 days ago
Installed a '07 STI. This turbo is definitely pretty to look at. This turbo might not be as big as some of the others on the market, but for the price per performance. It's pretty good. I'm happy with this turbo and I’ve been running it for 4 months now. Here are the numbers from this turbo: HP=338 and TQ=325. I've upgraded everything externally and the internals are still stock. I live at a elevation of 4400 ft and with 91 octane. My tune was a little conservative and down the road I will rebuild the motor to get more out of the turbo.

Verified Purchase

Dyno tune/street tune
IG: @dustyboi808 3 months 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 5 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
ISumner87 2 months ago
Do you have a graph or link to a build page? Curious to see the powerband. Have same engine and have been considering this turbo
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

  • Q: TGV deletes  T-Bone 8 days ago


    Do I need to delete the TGV's in my 2004wrx USDM in order to use this turbo?

    • A: You should be able to install this turbo with the required inlet while retaining the stock TGVs.

      Marcus E. 23 hours ago
  • Q: Camshaft  Challeen42 6 months ago


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

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

      Tyler A. 6 months ago
  • Q: Turbo  ArthurH 10 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 10 months ago
  • Q:   Leo01 2 years 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. 2 years 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