Both. LOL! I have personally seen at least a half a dozen before and after dyno runs before/after cat removal. Never saw a gain more than 8, saw a couple of 2 or 3 HP gains. Converter switching for exhaust flow or sound on an otherwise stock or mildly modded car is a very poor investment.
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2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm
Four that wanna own me
Two that wanna stone me
One says she's a friend of mine...
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