This time, we use another rear muffler design and bring it for a dyno run, to try out the horse power gain after the exhaust is done.
To access to the turbo downpipe, first we have to remove the top-mount intercooler of the EJ257 Boxer Engine below.
A closer look at the turbo and the stock downpipe.
View from the underneath, you can see the turbo outlet after the stock downpipe is removed.
Factory stock downpipe with catalytic converters Vs. Supercircuit 3.0" cat deleted downpipe.
Centre section is made with grade 304 stainless steel CNC mandrel bent 3.0" piping with a resonator.
Rear muffler is a twin transversely positioned 2.5" straight flow stainless steel muffler, matched with 4pcs titanium-effect stainless steel tailpipe.
The dyno results is very satisfying for a factory stock Subaru Impreza STI 2.5 A/T with just changing the full exhaust system from SuperCircuit.
For more information about the above Subaru Impreza STI 2.5 Hatchback exhaust customization, please contact us at SuperCircuit Exhaust Pro Shop, Sunway. Tel: +6 03 5632 2855 or join the SuperCircuit Exhaust facebook for more updates.