To be honest, I just wanted sound. I have one on a stock Miata 10AE engine from '99. At idle and on normal/restricted driving it's as quiet as stock. Accelerate at higher speeds and the beautiful intake sounds will begin. The more throttle (with load), the nicer the sound (and the volume increases). I love driving through tunnels, putting in some gears and hearing him sing! I wouldn't recommend it if you prefer stealth. The quality is top notch, as is the ease of installation. Perfomance? Judging by smiles, then I give 5 smiles!
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