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Just my personal experience, the 987 airbox mounts to the original location. At least 3 and yes you will loose the Hemholz chamber the 986 had as there is no space. Impressions to me driving it is that I lost a bit of low end just around 2.5-3.5k rpms but by 4k you are really booking and linear all the way. Just a bit of trade off but that push from 4K is really nice and looking back with the smaller TB it just felt slower between 4K and redline. By Butt Dyno it really feels like there's more than the numbers suggest.
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