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NA motors do not get huge increases in power with intake/exhaust. The breathing restriction is due to the head. The exhaust system will make increases but only with headers, no cat, hi flow exhaust. cams will make a difference too but you need to properly tune the car to get any meaningful gains. There is a guy on the MR2 board with 467hp at the wheels with a turboed NA 2.2 engine. He's running 10's on street tires.
board.mr2faqs.com for more info.
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