It's about 4 or 5 inches (if it's the same as the 5th gens). JDMB16EJ1's right though, you can't use the Dseries header on the Bseries head. In fact, you can only use a B18 header cause the B16 is not tall enough to wrap around - just a little tid bit for ya.

Just drive that bish up to the muffler shop open header :rockon:

BTW, I have a stock exhaust maniforld for my B18C1 I'll sell ya if you need it. OR I can get DC Sports, Comptech, Apexi, Greddy and JG headers new. PM me if you need something.