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On 7 Jan 2004 at 17:07, phillip bradfield -- volkshaus wrote: > >> Hey all. Just wondering how much of a difference a tuned header will make on > >> an engine. By tuned, I mean a header that has equal length tubes from each > >> exhaust port to the collector. This compared to a header that has unequal in > >> length tubes. > >> > > Ths Bill Fisher book covers this rather well. I think he claims 10-15%. This > > should be balanced against the downside of imperfect fit and ground > > clearance problems. Note also that there are differences in length between > > different brands of OEM exhausts. > > Wow. 10-15% - if that's accurate, that's significant. You really should check the book rather than take my word for it. It's been quite a while since I studied that section. I DO recall that he makes the point over and over again that the exhaust can make the biggest difference of any bolt-on modification. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org