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Tomei Expreme Twin Scroll Exhaust Manifold Large Piping JDM ( Part Number:TOM 414001)

Tomei Expreme Twin Scroll Exhaust Manifold Large Piping JDM

Part #: TOM 414001
MSRP: This Item is no longer available.



Brand: Tomei
Includes Catalytic Converter: No
Installation Hardware Included: Yes
Manifold Design: Equal Length
Piping Coating: No
Piping Flex Joint: No
Piping Material: 304 Stainless Steel
Manifold Type: Twin Scroll

Mfgr. Warranty: No Warranty
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.
RallySport Guarantee


The September 2002 model Impreza STI was given a big upgrade & improvement. With the introduction of the twin scroll turbo charger & all stainless steel equal length exhaust manifold. With the high performance potential of the new exhaust manifold it was said that development of an exhaust manifold that could surpass the standard type was impossible. However at TOMEI they challenged that claim and they persistently tried to make that claim false. With over 10 new samples, they extensively put every single model thru its paces and thoroughly tested them. At last, finally they completed the TOMEI EXPREME Large Piping exhaust manifold which has surpassed the standard model.

For higher horsepower cars TOMEI tested all various types of exhaust pipe diameter combinations & found the best combination of 42.7mm (pre gathering section), 45mm (post gathering section), and a 45mm uppipe.

These manifolds are manufactured using a Lost Wax process designed to eliminate cracking from welded weak points and for aiding smoother exhaust gas flow without any interference. Using 2.5mm thick pipes made from SUS304 stainless steel ensure you are getting one of the best pieces on the market today.

This is a twin scroll manifold and will not bolt on to any stock USDM turbo. This unit was designed for the GD/GR/GV Chassis JDM STI's that had the factory twin scroll turbocharger. This version has larger piping and is meant for cars with aftermarket turbochargers.



Great piece of engineering - video and photos attached
@Ryguysti 2 years ago
I've had this header/uppipe combo for almost a year now with no issues. I bought this for my 2011 STi when I was swapping my built motor over. I decided I wanted to be a bit different with my build, so I chose to go with a stock-location twin-scroll turbo. Obviously, the stock VF48 would not bolt up, so I opted for the Blouch 3.0xtr w/ the 10cm hotside and 3" compressor inlet (I have a review of the item on RallySportDirects website). I chose to not wrap the header w/ the included DEI wrap for fear the wrap would hold in moisture and cause the welds to crack. In the future, I would like to cermic coat the entire thing. Fit and finish are superb and the welds look phenomenal. After a few weeks on my car, the header turned into a burnt titanium color. Very cool to look at. If any of you are interested in a video of the sound or photos of the welds/color of the header, go follow me on Instagram at ryguysti.


  • Q: Will it fit?  KING 1 month ago


    So i have a 1997 wrx sti(JDM), I have a twinscroll VF37 that i want to install. Should this fit even if you say its for 03 and up?

    • A: This manifold is currently discontinued.

      Luis L. 26 days ago
  • Q: 2003 wrx fitting   Kuma 2 months ago


    I have a factory 03 wrx wagon will this fit with no modification?

    • A: this item has been discontinued.

      Devan M. 11 days ago
  • Q: Fitment for Blouch Turbo  jonsimonton86655 2 months ago


    Does this Twin Scroll Manifold directly bolt up to the Twin Scroll Blouch 1.5 and Twin Scroll Blouch 3.0 you also have for sale? I know I'll need the supporting downpipe, just curious on the manifold to turbo fitment.

    • A: This will bolt up directly to the Blouch Twin Scroll turbos.

      Jared A. 2 months ago
  • Q: SUBARU WRX 2010 TURBO  lalala 3 months ago


    Hi !!! thats fit for subaru wrx 2010 ??

    • A: This product is currently discontinued. For fitment and availability please contact Tomei.

      Karsten B. 23 days ago
  • Q: FITMENT  clarencebumanglag18 6 months ago


    Will this fit my 2017 WRX 2.0L Base Model?

    • A: Unfortunately, this will be specific to the JDM Twin Scroll and not the FA20 Twin Sroll the 2015+ WRX models have.

      Brady R 6 months ago