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I made 72 rwhp with a PI swap and my "PI-bottle" won't run out and I won't have to keep spending money to fill it. [&:]
A PI swapped 4.6 is a great candidate for nitrous. Also the torque curve associated with the 100 shot is insane. Nitrous makes more power than a PI swap, however If i had a NPI I would PI swap and spray the shat out of it.