thats interesting as its sold on here by some as the best option for the most gains,
2HP is well within normal dyno variations, would take that with a pinch of salt tbh. Even 2 pulls of the same car back to back will likely give a difference of 2HP between them
One 350z goes for a remap and has its "before" runs conducted. A cosworth filter is then fitted and on average it's 2bhp down (and never shows any gains). The cosworth is then removed and the standard filter put back in. The bhp is now back to the original average and is remapped with the original filter still in place.
Thats the kind of testing we need rather than "feels more responsive, livelier etc etc"