[JSeery]

An intake riser will normally raise the torque curve to a higher RPM range. Other than that it is not going to do you much good and will most likely reduce low end performance. There may be some benefit to a performance application where the car is geared, jetted, etc for it, but don't think it is going to help on a stock application.

What rear axle ratio and tire size are you running?

If you are interested in bolt on performance increases you might be interested in JWLs book. He documents numerous dyno runs with various modifications to a basically stock test engine.