That's because you DO feel the increase with those. That mod is worth its $300 price. The sound is worth about $50-100 of that.
You're on your own with that one. It produced repeatable results in every test I've seen, no matter the brand. Track tests and the gains are real. I'd call them "minimal gains", not huge.
Mine is a BBR ORX and at the time I had a BBR tune once again I'm sure it had to with air but I got no gains at all at the track.
But it did show a difference in roll racing vs cars on the street just ET's and MPH were the same.
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