SuperCrap muffler...
...is pretty rowdy sounding.
Assuredly too rowdy for steet use.
Yet, many folks have commented
about nice Italian music.
At 8000 rpm.
Some of whom are here at Xweb.
Many of whom drive other racecars.
When turbo muffler that came on my DarkBlueX failed,
all I had on hand for quick fix prior to a trackday
was old SuperCrap and coupla mandrel bends.
Incredible improvement was gained at upper rpm range!
Setup with a passle of diffuser rings,
which are also spaced out with washers,
and mounted with long SS bolts.
Upside is significant weight loss aft of rear wheels.
Which is a good place to lose weight.
Especially on this X...which has nothing aft of rear wheels
except the outer skin.
Notice dashboard visible through taillight opening...
I have no doubt the official word on SuperCrap muff shortcomings is gospel.
But for simplicity of construction, light weight, and virtually no cost,
it works for this un-schooled ol' country boy.
Pic shows current setup utilizing a short can version.
Picked up a long can version for one dollar,
which will accept more of replaceable fiberglass packing
and hopefully quiet it down some.