Zorsts are all down to personal preference, I run leo vince's on my TL baffles in are still stupidly loud so get left alone, I had a carbon can co on my zx9 which really was a high rev squealer but not so loud on idle, ( a hit with the neighbours) but the best ive ever ran for build and ease was a venom stainless steel can, fantastic sounding with a sprung loaded link pipe and removable baffle, on overun a flame could leap out up to a foot long, on race fuel the bike a suzi 600 was a rocket baffles out, on road not so clever, ran better with them in, but for value for money and ease of adding or removing the venom was much better than any acrapovic.