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Performance loss
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Old 04 Apr 2008, 02:08 PM   #1 (permalink)
Fresh Scooby
Join Date: Nov 2007
Location: South Wales
Posts: 3
Performance loss

Hi all,

Recently fitted a custom free flow backbox to replace the std twin peashooters on my 2003 WRX. Wasn't looking for power gains as such - just to improve the engine tone.

Since fitting it appears that the throttle response is a little more sensative as it over revs occasionally on gear change, but it also seems to have lost a little power (doesn't throw you back in the seat when giving it the beans as much as it did before). There seems to be a little bit of a flat spot now and again as well.

Before I revert back to the original, as anyone had experience of this?

Would changing the std air filter to an uprated panel filter improve things (sometimes backboxes and intake work together)?

Would the car need retuning after uprating the back box?

Or should I just go back to std?

Thanks for your help,

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