just installed the stillen CBE and berk HFC. the cats went on without issue, fairly easy.
the CBE install went good as well. not sure why so many issues with it...... have about 1/4 clearance above the crossmember.
what i am not happy with is the sound. there is the audible hiss at about 2k rpm. its almost embarrassing. low throttle is sounds pretty "clean" and at WOT it sound ok, but at partial throttle is almost sounds broken. i checked for leaks, and there is none. at partial throttle is cracks, and sounds like my old tacoma 4.0 V6 with no cats, and a muffler leak.
unsure if i want to keep it, or sell it and wait for something that sounds like it belongs on a 40k car.
also, the tips....... they really made my 16 yr old that drives an old beat up honda jealous. do they really need to be that big, and stick out that far? common guys.......
edit- also, for those curious on install times, it took about 2.5 hours using a pair of jack stands in the front in the driveway. anyone with a few tools and mechanical ability shouldnt have any issues.