Quote:
Originally Posted by DukeofAlexandria
Again, cite your literature and where you read that? Unless you can cite a hard number source or detailed engine specifications, this argument doesn't hold water.
Yes, they can increase torque, but only in lower compression engines; usually below the ~9.5:1 ratio. This is a well known thing and why scavenging using an x-pipe has been preferred since the early/mid 90's - early 2000's in many vehicles.
An S65 is a 12:1 compression in it's stock form, an H-pipe would most likely be detrimental to not only the engine pulses, but also the scavenging effect. Unless you can give me hard numbers, I just don't think an H-pipe is worth your time.
-Duke
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That Evolution system is closer to $6k retail, I think mainly because it's completely titanium (although now recently discontinued).
Dyno results would be ideal, and that's what I'm wondering about.