Definitely not you bud, the figures in my signature are made on a PWG x35i engine with only a Downpipe and flash on a custom tune...your car making 260/599 is not very high either however no matter how much power it puts down, if not done safely it doesnt matter at all.
I would say that if you have enough knowledge and are comfortable with flashing your car and dealing with any hiccups with the engine then go ahead and get plug n ply and enjoy. If you do not and just want a reliable tune and don't want to fiddle with it...then go get a custom tune...it will be tuned to the way the car is right now. Also, ensure maintenance on the car is done...do a thorough check before loading another tune cause you have no idea right now what collateral damage you might incur due to the current tune. Thereafter go get a custom tune done when you happy that the car is healthy. Rather safe than sorry...I would say contact Xcede
@Sherwin@xcede has done these cars for ages and in every release and platform these engines ran in.