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Prob because most people buying these systems do not know any better, or do not do a before and after dyno or did find out they only gained 5hp over a $300 test pipe and are crying in a corner instead of saying anything on the forums lol.
If your not SC its snake oil.
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4.4L LC stroker/ESS VT2-625/Volk te37 sl's/AA exhaust/DSS Carbon Fiber driveshaft/ARH Headers.. etc |