And op. it's probably normal. I know some 135 guys are having idling issues where car stalls and revs go up and down on idle after Installing a Catless downpipe
Current: 2011 Honda Accord.
Past: 2013 335i 6mt msport
JB4, ER Downpipe, ATM FMIC, aFe Momentum PRO 5R Intake, Pure Stage 2
Past: 2011 335i coupe 369 whp/444 torque