Quote:
Originally Posted by BeachM5nster
I will probably buy active autowerks catless downpipes but if anyone knows of a a better brand or a reason to go with another please let me know
but my Questions here are:
1) How difficult is the install? should i get dealership to install or can just a muffler shop do it? (is it hard to access?)
2) will catless DPs foul my O2 sensors or decrease their lifespan, should i just get new sensors along with the pipe?
3) Should i remove the resonators that are in the mid-pipe section of the exhaust?
any other knowledge on this appreciated.. a guy on here said a catless stock M5 is same as a stage1 with cats... so im just gonna go catless to avoid messing with bmw's stock maps bc i want to stay stock in that area
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I gutted my stock downpipes a few months ago with my buddy. Rented a lift in a garage, had torx bits and o2 sensor socket. Took about 5 hours to get the pipes out, gut them and put them back in since the car had been up to operating temps. Overall super happy, and it's not a difficult job at all