M4 makes Great exhausts.
MooreMafia told my friend he could make the same hp on his '18 gsxr1k with the M4 as the PentaCarbon...and it did.
I put the M4 on too, and the fit is excellent.
I put the optional double length baffle(not included) in last week, and I prefer it to the included short baffle or nothing.
The carbon fiber still looks the same after around 7 months and couple thousand miles too.
I would think the Busa exhaust would be just as good, just as they have been in the past.
Loud with no baffle...Loud.
Still loud with the included baffle, but noticeably quieter.
Both very raspy, like Brocks.
I added the optional double length baffle recently, it is still noticeably quieter, and the tone sounds more 1000 superbike than ear bleeding drag racer.
The 3 different ways make for good sound choices, from obnoxious to average db's.
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