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Originally Posted by ZMan8
The only headers that are worth putting on are long tube headers. Just regular headers (stillen) only give a marginal horse power bump.
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Very true.
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1) Headers will give you a slight performance increase but its a pain in the butt to do (small/cramped work space).
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Also hard to understate. As far as home garage bolt-on jobs go, there's really nothing more frustrating and difficult than a header install on this car. You better really think the pain is worth it. It is to me, but I wouldn't want someone to walk into this thinking it's as easy as changing out the catback
I'm not sure how all the loudness options compare in fine detail, but FI LTH + FI Catback is a *very* loud setup. There's very little restriction or muffling from engine to tailpipe. You will wake up and piss off your neighbors in the early AM :P