I ran F.I. LTH with my stage 1 SC and gained nor lost anything. I would imagine the heat was lower since there was less restriction but I never got a change to measure any real temps on the exhaust side.
Really for an open header-back setup you will need to pair the SC unit with the open exhaust setup. The Stage 1 by GTM really does not benefit nor hurt with it, not sure on the 1.5/2 units.
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