Value/Tradeoffs of an Intake Silencer Delete - Subaru WRX Forum
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#1 Old 05-02-2014, 10:05 AM
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Value/Tradeoffs of an Intake Silencer Delete

Are there any trade-offs of an intake silencer delete on an '04 WRX, and does it require a protune to take advantage of the improved breathing?



As of today, I currently have the following improvements to my otherwise stock '04 WRX:

o Invidia [catless] turbo up-pipe,
o PTP turbo blanket,
o Invidia Q300 + divorced wastegate downpipe w/cat and
o COBB AccessPort V3 Stage 2 91 v310 tune.

When asked if there are any compatibility issues with the silencer delete, COBB support says:

"From our experience, this is not an issue on the 02-05 WRX."

Laszlo - blue '04 WRX
Meet the turbocharged rally-bred Subaru WRX.
blue '09 STi - lease return
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#2 Old 05-02-2014, 10:11 AM
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I don't believe there is actually "improved breathing". As long as your intake box is the same you will be fine

05 WRX Wagon - East Coast Swappers Protuned "Stage 4" w/Cobb AP
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#3 Old 05-02-2014, 10:39 AM
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The intake silencer restricts airflow by a negligible amount. You may see a minor power gain but for most users it is increased throttle response due to a stiffer intake system and increased volume that makes the butt dyno happy. The silencer effectivly acts as a holding space for vibration and static air. When the turbo spools and the intake (pre turbo) is under vacuum you want to be sucking in fresh air rather than static air warmed by the engine bay. the limiting factor on the stock intake is really the panel filter, and even then its good for 350 whp as long as you are keeping your stock panel then there is no reason to re-tune.

TLDR No Pro-tune required for silencer delete but pro-tunes are always recommended.
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Jason
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