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To be honest, I am not really sure how much of an effect just the front pipe has but I am certain you will see some gains.
I do know that the stock over pipe is rubbish and there is a lot to be gained there.
Is your priority to gain sound or power? If just sound, the front pipe will add some. If you want both spend the extra money and get an over pipe as well as a front pipe.
The main parts of the exhaust that you will really see hp gains from (other than the obvious header) are the over pipe, front pipe, and possibly the axle back. The mid pipe really doesn't do too much. That is why Nameless doesn't make a 2.5 inch mid pipe. But they see a 12hp gain just from over pipe, front pipe and axle back.
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