On the exhaust pipe diameter, bigger is not always better, so consult a professional exhaust/header fabricator when it comes to appropriate diameter, cause yes restrictive pipes hurt flow=hp/mpg but a necessary diameter is needed to keep thing moving fast out of the engine-velocity.
oh and no exhaust leaks! lol
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Uh, because you are incorrect. An open header, PROPERLY JETTED will not require "more throttle" and will in fact give you better mileage.
This thing is not a two stroke.:hello2:
The only reason cars have exhaust systems made the way they are is for cost, noise, and emissions.
EDIT I see you are already talking about OPEN headers, and I was thinking the OP was talking about the MUFFLED EXHAUST SYSTEM, IE from the header/ manifold and back.
You are right about an OPEN header, low end torque will go away if too big. I doubt this is possible with a system clear back to the bumper, unless it's literally dragging the ground.
Yeah I know I'm right, and you can fit 3''+ pipes in a 67&up a body, so are you gonna stick a 3'' pipe on your slant??
1st you're not quoting what I entirely said, and 2nd you prove me right by mentioning collector diameter and it's effect on low end ...therfore the reaction of most would be to step on it to mask it till into the power band.
btw at the same throttle position, richer means more gas used.
I already said small can restrict but that there is a usable size limit per app.
Race cars can use the gains from an open header, on't get me wrong, but thats at a way higher rpm-higher exhaust speeds/faster pulses.
so rpm range is another factor, whats this guys range?
velocity with exhaust is like an open water spicket blowin water a 1' 1/2 out, then stick a hose on it and it flows 3 ft and a solid narrow fast moving stream.
don't confuse what I said, I'm not the one whos wrong.