Yes it will hurt HP and torque. That intake is designed for smallblocks spinning to 7000 rpm, not a stock motor! Even a car with heads/intake/cam would have WAY too much intake with a TFS R. Stick with a Street Heat, it'll have much better street manners and there will be a significant gain over the stocker once the turbos go on. This intake is almost a touch big for a stock motor anyways.
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1991 LX Hatch 5.0L