True to a point Plain Jane. You do not feel horsepower, its just a method and schematic to sell customers. Torque is the ability to work or move. If you add an intake to your OEM rest of the car, the only thing you will notice is sound more than anything. You might gain a few ft lbs but nothing like a turbo upgrade.
Manufacturers build and research these engines to meet EPA and OSHA standards across the 50 US States and other foreign countries standards. You may think there are restriction points, but really in today's world of engines, there are none. Actually, some manufacturers have parts that work better in flow than what the aftermarket can provide. You just need an equal balance of flow through the engine is what your after in performance.
So if you plan on upgrading your intake system, you may want to consider the parts it connects to (throttle body, intake manifold, bigger head port size), then have it follow through after the combustion process, header, downpipe, cat-back system. Then a tune will be needed to balance the correct air/fuel ratio mixture to combust properly.
Just remember your engine is nothing more than an air pump, it needs air to pull in and push out.
2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille
Last edited by 5t3alth; 01-30-2014 at 05:23 AM.