I've heard of folks running them like that, but never heard any long term results.
Personally I wouldn't do it. There is a science to exhaust tuning. You could decrease the performance.
And then yesterday a post was made in this thread about the owners bike running so lean his pipes began to run red hot and caused issues. http://www.ducatimonster.org/forums/...help-s4rs.html
Now that doesn't mean it can't work, just means you need to have the fueling adjusted to match. In general terms you should always consider a cause and effect when doing things to an engine. When you do something to one area, what do you need to do to to another area to get things back in order.
09 Aprilia RS125 plated< blew that sum bitch up! New engine build soon. Rest in pieces sweet heart. 10/14/2016.
06 Paul Smart Sport Classic NFS ever.
08 S4RS Tricolore #081 NFS ever.
The pink Monster has moved away.
97 900SS CR
72 Norton Commando 750
03 KX60 with S4R rear shock,Honda CB350F, Hodaka Ace90, 3x Yam-YGS1, Yam-CS3 200, Vespa small frame, Gilera 106, Puch Sabre, Puch 50 Boy Racer, Benelli 250, Benelli 360, Honda CB350T, and many more.