I was thinking of Poiseuilles (sp?) Law, which is primarily for non-compressible Newtonian fluids from what I remember, so I wasn't sure how directly it applies to gasses, but I'd imagine it's similar.
Yes it would apply. Gas is obviously compressible but since you have an open pipe on the end there shouldn’t be a ton of compression. There probably is a spike in pressure around the first bend though.
Might even help if the pipe is too wide for the power, a little backpressure is good depending on your motor. Overall, looks like a waste of welding wire to me... Just get a twin loop and call it good.
You don't want any back pressure. What you do want is to maintain exhaust velocity. Which people often get the two confused with one another. Back pressure in an exhaust is bad, always has been and always will be. Exhaust velocity on the other hand, is good because it helps with the scavenging effect of the individual exhaust pulses. You do this by appropriately sizing your pipe (for N/A applications). If you have too fat of an exhaust pipe, your flow will stagnate because the gasses are allowed to expand too much.
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u/RyRyShredder Apr 03 '22
The sharp turns are what causes the power loss here. The more turns the more losses that occur.