Quote:
Originally Posted by flmont
I don't know much about anything..But it looks like your stock exhaust header would flow very well compared to the new header's unless the pipe diameter is way small ?? Frank
PS..That truly sucks about those Damn bolts ,that's some work for sure !!
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The longer tubes in theory should allow the gas to exit at a higher velocity and promote scavenging even though there are some bends in there. Good scavenging normally helps with power delivery in the mid/high rev range since the gas can escape faster and is being sucked down the tube by the previous exhaust pulse. The stock headers don’t really have any sort of collector or design to promote good flow. Obviously they work just fine, but probably could be improved.
Now I’m not saying that these cheapy headers were designed with a lot of thought in mind so they may not be the most effective, but at least that’s the idea with longer tubes and a central collector.
A helpful video to understand exhaust velocity/scavenging:
https://youtu.be/jjPeP_Nn2B4