surprisingly no. i felt a gain. and i like it. i am boosting about 6.5 or 7 on my stock piecocrap gauge. so i went up in boost. i have two cats and a resignator so i think i have plenty of back pressure from them cats. but i get worse gas mileage. haha. thats a price i can handle... for now... ha
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91' 7m-gte, sold 
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