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Figured I'd revive the most recent thread... I ran Tomei UEL, OP, and 60R for two weeks with the HKS FP. I didn't hear any fluttering, but that might just be because the setup was so loud. Now I swapped back to the stock FP and hear the fluttering under load. I went under yesterday to inspect and no leaks at idle or signs of soot from a week of driving... Is it mainly the collector design that causes it? 4-1 at low rpm (not ideal) vs high rpm (ideal)? I think the consensus was that's just how it is, but I wasn't sure if anyone figured it out.
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