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I have a very stupid question but i gotta know... i took off the butterfly valve and it sounds really kool.. now i was just wondering, do we have to do anything wth the air filter.. i mean therez just a big hole now after we take off the butterfly valve.. does the filter still filter air? since air is coming in from the side now?? dont really know how to say it but i hope sum1 understands what i'm trying to ask =P
 

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mainly jsut for sound..someone did a dyno but it proved very minimal gains(<1 HP). my friend removed his butterfly valve on his 6 cylinder mazda6 and it sounds like a beast.
 
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