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I ended up getting one in a trade and ran it on my internally stock ka. You can definitely hear the exhaust note change and the throttle is a little "crisper" (for whatever thats worth), but what I did see is better fuel economy at the track (willow springs big & small track) When beating on the car at the track I was able to complete an additional run group before having to refuel. So, yet mostly unnecessary on street cars (though not bad) it is beneficial to those of us that see track days on occasion. Just my .02, its worth the install time.
-Shaun
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