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Message: <blockquote data-quote="Cope" data-source="post: 2443294" data-attributes="member: 49998">Headers and extractors are one of the most cost effective way to release the pent up horses in your engine. The choice whether you get the 4-1 or the 4-2-1 depends on your preference where you wish your powerband to be.The exhaust system main priority is to release the burnt gas out of your cylinder as much as possible at the highest speed possible. So the material isnt a deciding factor unless you're talking about budget. A Mugen stainless steel header for the B18C functions just as well as the stock Type-R header (been there.. done that.. waste money). What's important to note is the overall size and length of the whole exhaust system from the header up to the muffler cause when i got my car.. the exhaust was of poor design.. (2.5inches diameter. Estimated cost around 300 something probably) and only later on that i changed it to a stock ITR header only. The rest from the collector or extractor to the muffler remains intact. Substantial increase of power can be felt all along the RPM range but the throttle response was still a bit sluggish. When i changed the whole piping to a smaller 2.25inch with Mandrel bending done on the curves that the engine finally feels and sound right. Finally, a good quality stainless steel header can cost right up to 1000+ but its the one most substantial performance mod that can be done and worth every cents.</blockquote>

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