04 lancer es after market muffler
 

Hello I'm wanting to replace my muffler and put in a cherry red glass pack
My question is
Can.i just replace the old muffler and put in the new one without replacing the exhaust pipes

Yes you can... I've done this to just about every car I've owned. You may need an exhaust pipe adapter depending on your exhaust diameter and your new muffler diameter... If you go to any parts store they will help you find an adapter for your exhaust.