The power engineering system is identical to the Magnex, was a beautiful welded up/finished exhaust but then at 680 delivered to me at the time i enquired was just to much for me, magnex wanted 560 and i got both Collins systems at the time for my 500 and sapphire for 640 delivered so was a no brainer at the time, but in hind sight wish i had bought either of the Magnex or the power engineering ones as they were the same shape as the original ford one, 2 centre boxes side by side.
Loads of ground clearance with either of these.
If you have your car lowered i would think carefully about the single pipe systems as they will ground out, if i have 2 people in my 500 and pull out an gun it to overtake cars sometimes the centre box will catch the cats eyes, and it looks as if i have plenty of clearance when static.