Well, only problem is that it's a not-so-adjustable thumper... not too much as far as tuning I can do from what I understand... a guy on another forum suggested this, but I don't have the know-how with welding or the supplies to do it, otherwise I'd give it a shot.. btw, the exhaust on my bike does not have the valve - just a regular muffler...
mark around muffler 7'' from back.
cut through with hack saw.remove centre pipe.
cut 1st & 3rd pipes back
enough so u can join up with 1-3/4'' perf tube.bend perf so it
connects up to 1st & 3rd pipes.
expand perf tube at one end so it goes over
exit pipe.align perf tube into place & tack weld to 1st pipe.
pack both ends with stainless wool packing.align both ends together & weld.
using abrasive flap disc in 4'' grinder, or whatever you have around the house, Finish weld & paint with flat black
heat proof paint.
