I have the same set up, with the catted pipe and everything. You might wanna get a can of header paint and coat that shinny surface. Once you install it you'll see how close it is to your radiator fan and connector. That cat gets HOT.
I used flame proof header paint you get at parts store. Put about 5 coats on there. It's a shame to cover all that bling under the hood, but it significantly reduce the tempture. I also re-route the connector for the right side cooling fan, just in case.
Oh and I doubt you'll need new clutch if you don't have much else, I assume your NA like me. I have Perrin CAI and Nameless exhaust. No where near the limit of the stock clutch.
Enjoy your new headers, you'll love it! I had to pay for mine....
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