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Awesome!
I haven't dynoed mine yet but plan on doing it soon (before COTA in Feb.)
My mods are very similar to what you want except for the 987 airbox, and I have a VR race tune. I also have a 3.2 factory reman engine (2006) with the big bearing, so I don't know if that is 258 HP stock or not. But if it is, I think I'm somewhere in the 290-295 HP at the crank. With 100 octane race gas, it might be slightly more, but it scoots on the track! I think you'll be pleasantly surprised. Not sure though if the 2004 SE tune will take advantage of all those mods. Hope it does!
Here are my thoughts:
Stock 258 HP (maybe more since 2006 was 280HP)
Tune +15 HP
74 mm TB + IPD plenum + 15 HP
Secondary bypass + 5 HP
Total ~ 293 HP crank (maybe a couple more on 100 octane fuel)
And the UDP might release a couple more to the wheels...
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2002 Boxster S - NHP 200 Cell Headers,test pipes,Borla CatBack,Competition Plenum,74 mm TB, EVOMS Tune,Tarett UDP,Eibach Swaybars,BIlstein PSS9s,TuneRS rear toe links,wheel studs,15 mm wheel spacers on all 4,EBC yellow stuff pads,Sebro rotors, EBS oil baffles,160 deg Thermostat,2 quart Accusump,full filtration remote oil filter,rad fan switch,custom gauge/switch plate, Race Capture data logging, 90K miles
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