Originally Posted by Venom
If you guys are still interested in a DP that won't throw codes, check out Wagner's N55 race catted DP. It is designed for flow that should be close to catless gains. Check it out! http://www.wagner-tuning.com/BMW-135...gine_p_64.html
No smell, no codes, about the same gains as a catless DP.
I would have to see some proof it is similar to catless....I have always wondered why the OEM doesnt install a higher flow cat if they can get better efficiency. Unless it is just a cost discussion.