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I agree that 5HP is hardly going to make a difference, yet I definitely felt the car wasn't pulling as strongly when pushing on a bit. If you look at how thick the standard filter is, and compare it to the K&N filter I have in, there is less air getting into the engine with the stock filter, without a doubt..... and having said all of that, it is also probably a bit of placebo affect as well, but hey, its one of the cheaper modding options out there, so why not. Also just to add, Bedfordview Toyota didn't even bat an eyelid at my BRZ exhaust, so I'm sure I could have left the K&N in as well.
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