i posted a response to someones post titled "need more top end" or something like that. I included a link to some dyno charts of before and after. the guy used a Bisimoto header on an utterly stock D-series 1.6 motor. these gains were throughout the RPM band and especially in the ranges you would be running. the engine used had many many miles on it and slightly enlarged exhaust ports already. its a stepped tube design using pressure waves and all that for scavenging....etc....despite the price, people swear by them! plus a really cool bundle of snakes is hard to beat. its a 4-1 with the curves and shapes made by science not just equal length alone.

ah, here it is. a message board post about the header and the experiences the lucky owner had with it.

http://pub161.ezboard.com/fbseriesalternat...picID=283.topic

the guys website. he is working now on a design that acts like a 2-stroke pipe for a 4 stroke car. using all kinds of black-magic. he is extremely well respected in the field.
www.bisimoto.com
[This message has been edited by airpiraterob (edited January 19, 2004).]

[This message has been edited by airpiraterob (edited January 19, 2004).]