Best advice I can give you...if you can do it yourself and you have another rig to dd...DIY every time. Best teacher is experience. If you build it yourself, you can hopefully fix it on the trail if need be...saddest thing to see is some "bought" rig that someone is driving and it breaks down and they have no clud how to fix it when it is usually something easily fixed.
I have an LCE header and high flow cat...with a Delta 40 Series magnaflow...who would have thought a 22RE could growl.
P.S. If ya need any parts during the "build up" just let me know.