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yeah the whistle is perfectly normal with an intake, because you do not have the resonator anymore. for the low end i don't know what to tell you other than to advance the ignition a bit. Maybe some headers will help you a bit. Anyway you have the slowest engine in thoise types of car: f22a4 which is a non-vtec engine. the vtec version have 150hp while you have only 135.
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