i have the mac o/r h with flows and it sounds awesome.. only problem i had was a leak on the passenger side manifold but that is common with any mid pipe. and use the sleeve/collar thing that comes with mac for the driver side or it wont fit right
I have a mac as well. I don't like how it fits the trans crossmember. They started the bend to the rear a bit too soon so when its tucked up nice and clean it rattles against my crossmember. Really annoying. I also had to do some minor welding on it from stress cracks in it (no idea how old it is as it was on the car when I bought it, it also had been bottomed out a few times by the looks of it).