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Originally Posted by emory70
how can freeing up the intake and exhaust not make the engine more efficient? .
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Easy. The cylinder head port design is most likely the "bottle neck". A combustion engine is simply an air pump. In theory the more air you let in, the more air you need to let out. So one would think that adding a free flowing exhaust, a K&N filter and re-jetting the carb would yield flow and hp gains. BUT if the valves and the intake and or exhaust port design are already at max flow, all your other intake and exhaust flow performance mods are useless. I would bet my left *** that if a GZ owner sent their head out to be velocity ported, AND added a exhaust, filter and re-jet, now I would bet you would feel a substantial difference. But again, the GZ was not engineered to be a stop light to stop light beast... LOL