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From my understanding it doesn't directly cause u to gain or lose HP, its a piece to ur Modding puzzle that can indirectly cause u to gain HP cause it helps keep the air flowing through ur engine cooler
based on the reading ive done and dyno results ive seen....it looks like the guys with an upgraded intercooler are making 10-20whp more than guys on stock intercooler with stock turbo.
the 3.0" one sounds like a decent price. do u have a website i can check out?
ETS has great products and customer service. I have their intercooler pipes and they fit perfectly. I'd go for their 3.5" intercooler, i promise you wont regret it.