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Originally Posted by slideways...
on boost, generally the best thing you can do is lower backpressure. theoretically, more volume in the exhaust manifold slows turbo spool just like more volume between the turbo and the throttle body. but more volume = less backpressure(with an ideal design). so just like in a n/a motor, basically its all about balance. fortunately, most header companies have already done the research for you. but the ebay crap headers wont. so dont get those. taking these things in mind you can tune your car to run like you want.
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the problem with the ebay headers isn't the flow. They actually flow very well.
You should stick to direct injection pontification
