darn.. thought that jet whistle sound was coming from the exhaust wheel on the vgt turbo? and hoping it was the same, since i was told but could be wrong that the tow x and tow power plus have the same 59mm compressor and exhaust wheels for their high pressure turbos?
Only sound difference you'd notice out of the tow power plus setup would be the noticeably louder turbo whistle in the cab. Exhaust and outside the cab won't really be any different than stock.