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evo 3 can possibly be a little raspy because of the 2.75" piping.
Header wise, you may run into issues if you go with the cheaper ones. You also might not. That's a chance you have to take.
Like everyone else said, work the exhaust from front to back. I didn't have that luxury waiting for my header to be completed for months and with the way parts were at the given time. Now you can easily get a header first and work on the rest of the exhaust to the catback.
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