Thread: How would switching from HFC's to resonated test pipes change the sound?
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Old 01-31-2011, 10:05 AM   #4 (permalink)
cdoxp800
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If your going to go SC you will want to keep the HCF. The reason for this is, if the exhaust it too free flowing you will lose Boost pressure with a Supercharger setup. I when was using Berk HFc's switched back to stock cats and gained 2.5 PSI and 30Whp/Tq.
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