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These are only 2 options because they’re only companies to make exhaust for 2021 IS 350 I would to know if anyone had experience with these companies and would like to give me feedback on which you guys prefer? I can link videos for reference down below
I have the Ark Grip, personally I wouldn't have chosen any other exhaust, everyone has their preferences though.
I like the way it sounds at idle, under load it sounds absolutely fantastic, and at highway speeds there is very little drone. There is a more noticeable drone at between roughly 1800-2300 but then completely dissipates. No matter which option you go to, there will undoubtedly be a drone though so don't let that discourage you. As well, the Ark had zero fitment issues.