Just the downpipe was messing with my boost control a bit in a catted dp, so after all you have on there you would be smart to get a tune and then the car would seriously transform a bit. Although it's funny the A/F is still good with an after market intake (albeit later models handle them far better than newer ones), as mentioned with injectors along with a multitude of other components you are now stressing without monitoring, it might be a bit much for long term reliability there. Do you have a gauge for engine, exhaust, and oil temps? How do you know everything is so kosher then if you don't? It's worth the money for a pro tune no matter how you dice it boss! You're car will thank you and that smile on your face at WOT won't lie either!
Only use roads to get to the dirt; Then keep it sideways! >;D