It's very possible, but every dyno is different 
But still, it is possible to gain that much at the flywheel with the right exhaust system and intake
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Dolan
00 Chevy 3500 Crew Cab LS, 7.4 ltr 4:10 rear. 70 series Flowmaster Exhaust, K&N FIPK, JET Chip, Drop in liner, Capitol Radial 265/75's
91 S Series Blazer, 4.3 liter 4WD Auto. Minor Engine mods, Spin Tech Exhaust
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