Can I hollow my cat on my Deville? I know it has an O2 in front of the cat and nothing behind itand I don't want there to be any problems, just a little more throaty out of the exhaust.

I had done this to an 89 El Doradodo and I had problems with the engine idle control module shortly afterwards but could not say if that had anything to do with it and right now the only prob with my deville is the stupis A.I.R. system.


Thanks!

 

You need to know whatyour jurisdiction's emission laws say. I think 1990 would still need to conform to OEM specs just about anywhere. Magna Flow makes a low restriction converter that may suit your needs.