I was interested in changing my cat to a 3" Magnaflow (oboII). The shop that did my custom duals said that it was california legal, it wouldn't cause CEL's and should not void a car's warranty if my DCX dealership allows cat-back systems.
My concerns are:
1. I thought that getting 3" downpipes were not availble for GT's. I know on the forums, there is a person that makes a custom 3" downpipe.
2. Is changing your cat considered cat-back? (i.e. 3" Maganflow with Mopar Duals considered cat-back?)
3. Anyone has a 3" magnaflow cat and care to coment on it?
4. I doubt the CEL will be a problem since an exhaust is being changed, but it just bothers me and I need reassurance that CEL's don't prop up.
5. Most important of all, does going to a 3" cat increase the noise level? The borla duals are at an acceptable level atm for me.