Your de has two header(s)!! That's sick is it a v6 or v8 de?
You can use the de header on the ve, but you will be choking it ALLOT. You could try porting the header with a dremel or similar rotary tool, should help out somewhat.
The ve is especially sensitive to exhaust design. Try and invest in the best you can afford you wont be disappointed.
Best of luck.
Dudeman