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Spec Stage I unless you are putting more than 400rwhp down. it's a waste to put a Stage II on unless you have some serious power. A friend of mine stated it best by saying "it's like a brake system...why spend $6,000 on a street car that makes it to the track once maybe twice a month when you'd be just fine spending $500 on an equally sufficient system for your amount of hp/ft-lbs?"