The stock resonators do create some backpressure. Backpressure is a give or take thing on NA cars, as backpressure increases low end torque but damages high end horsepower.
And yes, the short tails remove the muffler, the primary source of sound deadening and a little of the backpressure. You won't lose any noticeable power (maybe like an average of 2-3 torques, not enough to feel unless your butt dyno happens to have a lot of sensitive instrumentation in it), but yes, you will lose some torque.
I have an exhaust which is relatively high diameter, so I have no torque until the juice kicks in at 3500 rpm. The intake manifold is a good choice to get a lot of that torque back. A larger diameter intake (Akuma's comes to mind) will help bring some of that back as well.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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