Does anyone know of a good aftermarket muffler that will go good with an 01 cl-s, that will sound deep and aggressive to complement the CT headers & Down pipe?

 

Yea.

 

CT engineering mufflers will bolt up to the CL. Tananbe makes a cat-back but have to buy whole system. You can use any universal mufflers and have a shop weld them on.

If you want to go cheap then have a shop weld on magnaflow mufflers.