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Just installed Titan motorsport catless downpipe with generic 02 sensor CEL spacer. Also run a Dinan stage 1 controller. Noticing a slight decrease in MPG, is that common? I know the obvious catless means no restriction which means less work on the engine to produce more performance. And MPG...

Mahle part number OX1146D is the equivalent to the oem B58 filter. That & some Castrol Edge 0w20 has always worked for me.

$175 ready in hand & I can send you the label!

Running a stage 1 dinan/carbahn controller (still have new car warranty). Looking at going catless dp very soon & assume this will trigger the CEL. Any brand or L vs J style 02 spacers to recommend?

What brand downpipe did you run?

Still available?