Every single person will give you a different answer
If you want something loud then get a single exit with decats & headers - it will make a K1 sound silent
Something a bit more reasonable is HFC with a Blitz Nur Spec. ARC intake makes a much better noise than a pop charger also
Guess you mean this one? Seems much more reasonably priced, I'll have to do a search for reviews etc when I have time.
Thats the one Seems highly rated by the yanks
Not heard the Kakimoto in person but the videos I've seen it sounds pretty good
I've run a single GReddy exhaust for a few years & wouldn't run anything other than a single any more. My GReddy single is for sale btw