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Yes, you could have as much as 10 or so extra hp and as much as 10 or so extra pounds of torque. It does not materialize out of thin air though. This is not on top of factory ratings. This is whatever extra out of that makes it to the rear wheels from the engine. But realize, when they take these measurements they are doing it in a strictly controlled environment designed to squeeze out a few extra ponies at the wheels when everything is optimized. This means on a dyno at high rpm, in the perfect gear, temperature controlled, hood up, maybe a little extra air blowing on the engine. What it usually means in my experience is that the vehicle will pull with a little more urgency if you floor it at highway speeds but that's about it. Not much use stoplight to stoplight.
And before you ask, no, the advertised rating on the box plus for the exhaust plus the advertised rating on the box for the intake won't equal the improvement you will see at the wheels. Just doesn't work that way. There are plenty of setups with both that still only have 5-10 extra hp.
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Last edited by eharri3; 03-02-2012 at 12:51 PM.