does anyone know where i can get just the muffler or axle back system from? i know they have the catback out but i dont think its really worth it performance wise.

Roadracemotorsports.com

click mitsu symbol on the left.. then click ralliart in the middle, then scroll down a little then click performance parts....
scroll down about 7/8 of the page... you can't miss it ... unless i missed a step

i called them and they said they stopped carrying it.

RRM stopped carrying the axelback? well you could go with ultimate racing's axelback or buy just the magnaflow muffler.