LongLife dont test flow rates but He gave me examples, porsche etc and said all gained 20/30 bhp, doudbt its even close to 5 on mine but it feels more responsive and sounds great!
Better than one silencer, less restrictive! Wanted straight throughs but Lambda sensors prevented this and as they are sport cats already, I just excepted it!
I would have a good guess this system has better flow rate than Miltek, and its thicker steel with lifetime guarantee and the reason few parts are clamped instead of welded is for ease of replacement or tranfering system.
Not sure why there is a free hanging bonding lead near rear passenger silencer though but they said it was free hanging before so was left alone!