I picked up some used se mufflers from a budy that were on his 1998 rk i installed them on my 09 rk, it runs good and sounds great. But i haven,t changed anything else. Do i need to change the air filter and install a power commander. not sure.

 

You don't have to install the AC and PC but they will be your best bang-for-the-buck performance mod's, and the easiest.