Mine pulled 296rwkw then 304rwkw with the K&N, and managed the 12.81 on 296rwkw without any wrk done to it, the K&N gives them a little, catback gives a bit more but unfortunately where all the power is being held back is in the tuning... believe me once it's tuned you won't know your car, such a massive difference, can't even compare to tuning an XR6T or F6...