Well I fitted a scorpion non resonated system which is apparently 8.3kg lighter than stock it's a third the price and IMO sounds amazing. It's only gives a claimed gain of 0.8ps, but I never bought it expecting gains tho just mainly for the noise
I'll admit fitment wasn't great but the 30mins it took to fix doesn't warrant the extra on akro, I know about the built quality and sound from bike exhaust but obviously their a lot smaller so price isn't so much of an issue. Doubt I'll ever understand this but awell each to their own
as long as you enjoy it I spose it can't be bad haha