RE: Mac's mufflers/differences?
Hi!
Get at (small) magic muffler from Dave shadel at Performance specialties in Nevada instead!
You will get around 15-20% more power with one of those (same as with the long tuned pipe in your picture) but in a much smaller package (more like the black silencer in your picture which is no good... and terribly loud). Or get a MVVS mini-pipe and make an adapter to make it suit your engine and get the same power increase as with the Dave Shadel pipe (15-20%)but a lot cheaper.
Regards!
Jan K
Sweden