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Originally Posted by AlpineG05
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This is great info. Thank you
The CEL eliminator is unfortunately out of stock so I'll have to wait.
What are the repercussions to not having a catless dp? I'm asking because I have the JB4 with the BMS intake you recommended earlier (you're right, the sensor slot needs filed down). I realize flow will be inhibited without the dp (and thus hp reduced), but am interested to know if the back pressure will cause engine damage etc.
Also, my X5 2021 40i is only 10 months old and has just 5K miles on it - do I need to replace coils/plugs? Or should I wait to replace?
Thoughts anyone?