K-TUNED 3" CAT BACK EXHAUST HONDA CIVIC TYPE R FK8 2.5" DOWNPIPE FLANGEApplication: 17+ Civic Type R FK8 Note: *Some aftermarket downpipes may have 2. 5" stock flange size. Be sure to check before ordering. Our 3" exhaust is made entirely of 304 Stainless Steel. It is available in 3" flange for aftermarket 3" downpipe like ours or stock flange for OEM downpipe. It features 3 real mufflers and tips. The exhaust transitions from 3" to 2. 5" after the split to create pressure and push exhaust out the side mufflers and