Fitted my (Dremel tweaked

) piper manifold + 2,5 catpipe today.
Maybe because I disconnected my ECU a while, but I have a notorious dip in power ~3500rpm. Also after some driving through that rev range, it still feels like there is not enough fuel there. :eh: Go above 3800 and it is just like a switch till redline.
(Edit: It's not like the original midrange dip, but really no power between 3300-3700rpm..)
But an M62 will probably fix this.
Ow, and after some spirited driving I now have a engine light + fan running.

roblem: The 2nd Lambda is not liking that 200cel cat..
Do we have a working MIL eliminator scheme around here?