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Aftermarket Performance Parts for the Sti
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TURBOXS EXTERNAL WASTEGATE UPPIPE: SUBARU STI 04-09
PRODUCT OVERVIEW
The advantage of the External Wastegate is to help the turbocharger operate
more efficiently. This is done by relieving a large amount of back pressure
pre-turbine housing.
Less restrictive turbine housing will allow you to run higher boost pressures
which typically results in more horsepower and even the ability to run higher
ignition advance if needed.
It is common to see a 15 hp to 30 hp gain when going from Internal Wastegate
to External Wastegate setups. When boost is held flatter throughout the rpm
band, the result is higher horsepower numbers at less peak boost pressure vs.
the Internal Wastegate.
TIP: This will not work with the 4 inch Bellmouth Downpipe WS-DP, You will need to purchase WS-DP-EXT
Fits: Subaru WRX STi 04-09
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