Used y pipe from a 2010 RMK 800. Should fit many other sleds but check with your dealer to be sure. 

According to polaris.com this part fits: S08PB8ES/EE 800 IQ (2008)  S08PG8ES 800 DRAGON RMK 155 SPECIAL LATE PROD (2008)  S08PG8ES/EE/PH8ES/EE 800 DRAGON RMK 155/163/EURO (2008)  S09PB8ES/ESL 800 IQ/ES (2009)  S09PE8ES/EEL 800 DRAGON SP/ES EURO (2009)  S09PK8ES 800 RMK SHIFT 144 (2009)  S09PL8ES/EE 800 ASSAULT RMK 146 (2009)  S09PM8/PG8/PH8 800 RMK/ES/800 DRAGON RMK 155/163/ES/EURO ALL OPTIONS (2009)  S09PR8ESL/PS8ESL/EEL 800 SWITCHBACK/DRAGON/EURO (2009)  S10PB8ESA/ESL 800 IQ/ES (2010)  S10PG8/PH8 800 DRAGON RMK 155/163 ALL OPTIONS (2010)  S10PK8ESA/ESL/EEA/PM8ESA/ESL 800 RMK 144/155/ES/INTL (2010)  S10PL8ESA/EEA 800 ASSAULT RMK/INTL (2010)  S10PP8 800 DRAGON IQ/ES/INTL ALL OPTIONS (2010)  S10PR8ESA/ESL 800 SWITCHBACK/ES (2010)  S10PS8 800 DRAGON SWITCHBACK/ES/INTL ALL OPTIONS (2010)