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At what point is it necessary to to PnP the head or get a custom one like AMS, Buschur, Cossie? When you change to a non stock frame turbo? I thought the stock evo heads flow pretty well...
 

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I'm on the stock head (kel-b cams and springs) and have no problem making power. ETS' crazy HP builds use stock heads too. These open up more power, but who knows exactly how much. I do wish I'd ported my head during the engine build, but now I'll never know.

That is very pretty though. If I ever have to pull the head, I might send it their way..
 

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yea curious how much this makes on top of a big turbo...agreed very purty
 

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i'm very excited to see the numbers coming off the 900x kit. It may be in my future. or the 950, can't decide :)
 

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thats got all kinds of not fail written everywhere
 

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Very nice. AS far as power I am sure a stock frame turbo is fine with a stock head even on a ams 900 I doubt the power difference would much. But it helps you make same power a a lower boost level.
 
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