Great video and documentation, thanks. I've always been a fan of Phl's cored exhaust, even considered selling my Termi slip-ons to get them, they seem a lot deeper in tone.
I wouldn't doubt there would be some midrange and even top-end gains. Since he removes the cats and the flow is improved, it probably helps the AFR since even stock these things are ridiculously rich from the factory. If you really want a proven power boost, take the money you saved over buying any other aftermarket exhaust and buy a RapidBike fuel tuning module. I gained 10 hp all throughout the midrange and 5+ on top over the stock Termignoni slip-on map with my RapidBike Race module.
I wouldn't doubt there would be some midrange and even top-end gains. Since he removes the cats and the flow is improved, it probably helps the AFR since even stock these things are ridiculously rich from the factory. If you really want a proven power boost, take the money you saved over buying any other aftermarket exhaust and buy a RapidBike fuel tuning module. I gained 10 hp all throughout the midrange and 5+ on top over the stock Termignoni slip-on map with my RapidBike Race module.