I am still getting used to the sound, a lot louder (the HFC) than I expected - this coming from someone who had downpipes, uppipes, full turbo back on a WRX. It really isn't just on WOT that it starts to resonate sound either, mid point on throttle and you start to make discerning tones. Only had the CBE and HFC on for several days, but have managed to cruise by cops throttling at under 3k RPM.
Just my opinion.
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