Ritter hands down has to be one of the best pipes for the 2.5 Maxx. You will see an upgrade in performance.
https://www.ssl-stormerhobbies.com/c....pl?pn=RCR5152
There is also a new one out by RD logics. Have not heard anything about this pipe.
http://www.rdlogics.com/store/P_176.htm