i just replaced my o/r x pipe for an o/r h pipe. on my drive home tonight i was rolling about 20 mph in second gear and mashed the gas and there was a big hesitation. this never happend with my x pipe. there is no leaks, o2 sensors are fine and it was installed by me and two other ford mechanics at the ford dealership. i dont understand what the problem could be. i have an emailed tune by doug at bama. i wouldnt think i would need a new tune do u guys?