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1 if its not causing any problems no. I only removed the stuff because I installed a header and the fittings for were completly rusted
2 your going to need threaded plugs for your exhaust manifold, and block off plates for the intake. have fun with the vacuum lines
3 mine didn't it just weighed a few pounds less, and has a cleaner engine bay
4 I passed PA emmissions with egr and aiv removed the guy had to run it two times though.
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