If you're referring to the downpipe, then no, Hondata isn't required. Milltek has four different versions of the DP and this is one of the two that has a higher grade cat. Yes, I would sell separately.
I've decided to trade my DE5 for a CT4 Blackwing so.......
Flashpro with a Phearable STG 2 mp UNMARRIED (see pics) SOLD
Milltek part # MT-SSXHO238 high flow down pipe and titanium studs both never installed $750 shipped
Although I'm new I've had an account on civicxi for a while as I had a CTR...