2017-21 Honda Civic 1.5T High Flow Cat / Catless Downpipe

Still throws a lot of slow response 02 codes I got it for a NYS inspection and needed that 02 monitor on to pass but every time I reset it and clear the code. I have to drive it 100 miles to show the monitor hasn’t been cleared and messed with. So I’ve been driving dirty for 3 months now. Less drone than the catless , good build quality. The bolts need to be smaller with a washer base because getting that on to a beefy prl top pipe with the big ol 15s or whatever heads that come on the bolt become a box wrench battle of will. Overall quality of the pipe is great though

Love the sounds and the two step ability is great

Cold start sounds good with my exhaust you can hear and tell a difference in the airflow perfect fit