I’ve been using these for decades and have always noticed the improvement, subtle, but if you are familiar with your car, it is noticeable. Just makes the car feel lighter, or slightly more free revving. And it’s nice to know, peace of mind, that you have done what you can for the most efficient induction. I love that the panel filters are discreet too. A 57i kit is perhaps more efficient, if it has access to cool air, but everything is so standard, but just decent quality, with the panel filters. And then, you can just wash and re-oil every few years.
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