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You're probably looking in the range of 40 HP or so, if these are the only mods you make. Other mods can have affects on one another.

If you do these mods, go ahead and slap-on a hi-flow cat converter as well. It'll be worth it.

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Q: If you put headers catback exhaust injen full cold air intake on a lancer oz rally how much will the car increase in speed performance?
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