[BB_cuda]

Originally Posted by E85 Sport

These are the two I find on the market.
Big difference in price.
Any difference in sound and smell?

1. ATM SpeedShop downpipe made of 304 stainless steel $495 + $275 DOC = $770
2. TuneMyEuro BuzzKen downpipe made of 409 stainless steel $920 + $610 DOC = $1,470

I have direct experience with both. Buzzken is on our 2013/X5D and ATM one on 2011/335D. Both have DOCs. The 304 SS material on ATM unit is superior to corrosion resistance. I bought the Buzzken unit in Dec 2017 and the ATM one in Nov 2020. I have heard that since that time that the Buzzken unit has had an upgrade to its DOC and works even better now. I can't confirm this though as I have the older DOC that is 5 yrs old.

Another poster spoke to gutting a DPF but keeping the DOC in tact. I did this same thing and can confirm that without a doubt this method has WAAAYY cleaner smell than the others I discuss above. I ultimately pulled it to get a better flow and more sound from the ATM unit. I still have the gutted DPF on my parts shelf.