Quote:
Originally Posted by churchx
Best & cheapest way imho would be to put back stock air box (if you or previous owner still has it) with stock or aftermarket filter for it. As more expensive route i'd consider TRD or Grimmspeed intake. I'd ignore all the other options that bring more cons/issues/headaches then actual gains, including OP's HKS one.
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Agreed. Stock, TRD, and Grimmspeed should be the only options you're looking at for an NA car. Every other option has significant downsides, be it HP loss, filtration issues, or general headaches. The stock box is very well optimized and very hard to improve upon.
I've heard bad things about the mushroom filters since the late 2000s. Their filtration in particular is pretty crap IIRC.
I would not take any chances and replace the mushroom filter with one of those 3 options.