Try the Stillen HFC's maybe? I have the Stillen CBE + HFC's and it sounds great, a little rasp when flooring it above 4k-ish until 5 or 6k and then it stops. I'm not sure but have heard the Berks tend to be a little louder and raspier.
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Range Rover Sport Supercharged
Nissan 370z Touring + Sport
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