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I agree but to a point, as some point in the build even NA, it will cause a restriction, sure it is at the rear where exhaust gasses have lost lots of their energy. My guess on a health NA engine with LT, heads, cam 3 to 10 HP. Stock almost zero, on a health FI build I can see upto 12 HP but we are talking engines reaching 900+ HP. Now if you ask me is there any power going from 2 and 3/4 stock size to 3" dunno about that one, even on 3/4 FI builds...
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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