Tune required with longtubes???

I didn't have any problems after my MAC LT's were installed nearly 3 years ago. The O2 sensors did indeed need to be moved further back but a pair of BBK harness extenders took care of that. The engine did run a tad lean with the new headers but after I corrected that by raising the fuel pressure, I had a lot more power and I was very happy with the result.

I have a bone stock 5.0 and long tubes on it witch is arguably a dumb combo but its what is here. I have no issues that I know of my car runs hard no mileage problems or anything detectable. The o2 are farther down stream and it makes sense the o2's get warmed up slower with long tubes but at speed like on the high way or racing or after shes up to temp, it doesn't seem to be detectable to me as a problem. What I can say for sure, is that your car won't run like **** because of longtubes, if it was running right before. And if it does, its something else.

on a stock motor you wont notice any difference. stock headers are fine until you start opening the heads and intake.