I have an E39 01 M5 and it has a blown Catalytic converter. Im having some power loss issues and a cold idol issue and im figuring this is prob effecting the performance of the car since its slow as ass now.
Would would be my best option is replacing the cat? Factory replacement is out of the question since i was quoted 4000+ to replace it. . Should i go High flow, remove the cats completely (heard that the loss of back pressure from doing this will result in a loss of power) or is there some sort of oe style replacement.
I'm also looking in the market for a full cat-back exhaust system. I like the tubi (but they are hella expensive), but wanted to know what other people run and which brands I should consider (my daily driver is an A4 so I dont know much about BMW preformance) I already have 2 magnaflow mufflers in the back, and I want something that sounds more agressive + sexy
Some help in this matter would be greatly appreciated.
* Im also looking for a shop that has a lot of experience with M5's or M's in general. This car is my baby and I only want the best for her. Something close, or semi close to Toronto