New backbox fitting
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Hi folks,
I have a totally standard MY01 WRX, and a nice shiny Prodrive back box waiting to be fitted ... but should I wait until I get an ITG panel filter before having the back box put on ?
I can understand how the less restrictive exhaust will want more airflow from the front, but can't see that it would have enough effect to make something go bang in the meantime...
Opinions, please
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