DC Header Install Problem

[CB7 Fanatic]

I bought the DC Header with the 2.5" collector today. First of all, it's only 2.25" ID. They include a separate flange that has an ID of 2.5"What the hell am I supposed to do with this flange? The instructions say nothing about this flange. The DC Sports B-pipe is 3/8" shorter (the thickness of the additional flange) than the stock B-pipe. How the hell do I get it to fit? I feel like a complete idiot not being able to install a header even though I did my H22 swap and wire tuck . I can now understand why people hate on DC Sports headers. If anyone knows why the B-pipe is 3/8" shorter, how to get around that, or what I'm supposed to do with the extra flange, I'd appreciate the help. Thanks.

[CB7 Sleeper]

lets see a picture of the header.

[CB7Man]

Umm pull your exhaust closer? Theres enough play in the exhaust. Especially for 3/8"
Elbow grease my friend. Pull it closer and thread a bolt on. (Friends can push on the muffler.)
But if you like the 2.5" get it welded on and have the exhaust shop lengthen it.

I think you live in Cali, theres no 2.5" cat for your Accord thats legal.
A muffler shop then wont touch it. lol New laws, they cant touch things from the cat up. Cat back is different.