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not answering your question, i know.. but i have my solo HFCs waiting to be installed. just building up the confidence before i go ahead and do it.. but i also have stock exhaust except for the MRTv2 and res x pipe. ive heard it sounds great together, and ive heard the HFC give a decent kick up in power. some friends told me that with an intake, TB, exhaust, and HFCs, the best thing to do is a tune, which would add power thats being left behind by everything.
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