Subaru Impreza (GR) WRX STI Downpipe

A good and efficient downpipe is proven to be very effective for the Subaru Impreza (GR) WRX STI. 

Here is yet another Subaru Impreza (GR) WRX STI installed the SUPERCIRCUIT Catless Downpipe for better and unrestricted exhaust flow, hence faster turbo spooling and higher engine output.

The turbo downpipe is located behind the intercooler of the EJ257 engine below, so the intercooler and all the pipes connected to it has to be removed during the downpipe installation.

The SUPERCIRCUIT Downpipe is fully made with grade 304 mandrel bent stainless steel pipes and is fully TIG/Argon welded on CNC machined stainless steel flange for direct bolt-on application.

The stainless steel turbo outlet flange is bolted onto the Subaru Impreza WRX STI factory stock turbo flawlessly.

It is also fully compatible with the Subaru Impreza WRX STI's factory stock cat-back exhaust system, no cut and weld is required during the installation.

To purchase or to install the above Catless Downpipe made for the Subaru Impreza WRX STI 2.5 AT, please contact us or pay us a visit to our showroom in SS13 Subang Jaya Industrial Estate or the SUPERCIRCUIT authorized dealers nationwide.

For more information, please contact us at 03 5632 2855 or Send Us A Message using the form on the right of this page.

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Subaru Impreza WRX STI (GVB) Downpipe

SUPERCIRCUIT catless downpipe made for the Subaru Impreza WRX STI Sedan (GVB) with the auto transmission EJ257 boxer engine.

The Subaru Impreza WRX STI (GVB) EJ257 engine shown here, before the top-mount intercooler is removed, to access to the turbo outlet and downpipe.

Below is how the turbo outlet looks like after the factory stock downpipe is removed from the Subaru Impreza WRX STI (GVB) Sedan.

The Subaru Impreza WRX STI (GVB) factory stock downpipe with a huge catalytic converter vs. the SUPERCIRCUIT catless downpipe which is made with larger bore mandrel bent stainless steel pipes and fully TIG/Argon welded on CNC machined stainless steel flange for long lasting performance and perfect fitment.

At the top, the SUPERCIRCUIT downpipe is mounted to the turbo outlet of the Subaru Impreza WRX STI (GVB) Sedan and at the other end, it is compatible with the stock catback exhaust system.

This catless downpipe promotes better exhaust flow. It is dyno tested to provide plenty of low-end torque and high-end horsepower and ideal for ecu remapping/ tuning needs.

To purchase or for more information about the above SUPERCIRCUIT bolt-on catless Downpipe made for the Subaru Impreza WRX STI (GVB) 2.5L AT, please visit us at SuperCircuit exhaust Pro Shop, SS13 Subang Jaya Industrial Estate. Tel: 03 5632 2855 or Send Us A Message using the form on the right of this page.

Please join SuperCircuit Exhaust Facebook for more exhaust news and updates.

Subaru Impreza WRX STI (GRB) Downpipe

SUPERCIRCUIT catless downpipe made for the Subaru Impreza WRX STI 5-door hatch back (GRB) 2.5L AT.

The factory stock downpipe of the Subaru Impreza WRX STI (GRB) with huge catalytic converter on the right and the SUPERCIRCUIT larger bore catless downpipe on the left side of the picture below.

To access to the downpipe, one has to remove the top-mount intercooler from the EJ257 engine of the Subaru Impreza WRX STI (GRB) shown below.

The SUPERCIRCUIT downpipe is designed for direct bolt-on, installed to the outlet of the turbo on the Subaru Impreza WRX STI (GRB) as shown in the pictures below. The SUPERCIRCUIT downpipe is made with grade 304 mandrel bent 3.0" stainless steel pipe and is fully TIG/Argon welded on CNC machined flanges for optimized unrestricted exhaust flow.

At the other end of the SUPERCIRCUIT Downpipe, it is perfectly fitted to the factory stock catback exhaust system, no further mod is required.

This catless downpipe promotes better exhaust flow and is dyno proven to provide plenty of low-end torque and high-end horsepower. It is ideal for ecu remapping/ tuning needs.

To purchase or for more information about the above SUPERCIRCUIT bolt-on catless Downpipe made for the Subaru Impreza WRX STI (GRB) 2.5L AT, please visit us at SuperCircuit exhaust Pro Shop, SS13 Subang Jaya Industrial Estate. Tel: 03 5632 2855 or Send Us A Message using the form on the right of this page.

Please join SuperCircuit Exhaust Facebook for more exhaust news and updates.

Subaru Impreza (GR) WRX STI 2.5L Single Scroll Header

Subaru Impreza (GR) WRX STI 2.5L single scroll header development scene @ SuperCircuit Exhaust Pro Shop.....

SuperCircuit twin scroll header lying side by side with the stock Subaru Impreza factory stock single scroll header....

We are converting the SuperCircuit twin scroller header to fit this 2.5L single scroll engine.

The Impreza Impreza WRX STI engine with the header stripped off.

Close up on the extractor ports.

The factory stock Up Pipe of the single scroll turbo header, it leads to the turbo up there.

Ta Da! The final results of the conversion is here! Fit nicely to the Subaru Impreza WRX STI 2.5L (EJ25) single scorll turbo engine for a smoother exhaust flow and higher performance. The mass production version of this header is on the way!

For more information, please contact SuperCircuit Exhuast Pro Shop, Sunway Technology Park. Tel: 03 5632 2855 or join the SuperCircuit Exhaust Facebook page for more updates on exhaust news and photos. Thank you.