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Bassyboi has a yozza decat system on his RB CUP and its raspy as hell which is great if you want everyone to know you are coming. I love it!!
I have a Ktec ultra supersports which with a decat pipe (decat pipe now for sale). Its a great exhaust with a booming note. I noticed increased power gains with the decat fitted. It only has one baffle compaired to the sports and K-tec manage the noise levels so they are within the legal limit for track days.
I have since had the matching sports cat fitted which raises the tone a little but still sounds nice and deep. This was due to the laziness of not wanting to change the cat every MOT.
If I had to choose again it would probably still be the K-tec item cos the pipes fit nicely in the exhaust surrounds of the bumper. I'm shallow like that.