Quote:
Originally Posted by metromizer
You might think so, but most of the time, not true. An OEM engine combination was assembled with a cat, muffler, and long exhaust pipe in mind....
...In general, a tuned header and collector will net torque gains within the rpm range it was designed for, but you need to size the primary tube length, diameter, and collector style for your particular engine. It's displacement, camshaft and head flow ex. to int. ratio, desired operating range, muffler vs no mufler all come into play.
I mentioned in another thread that in dyno testing one of my race engines, I experimented with several headers and mufflers to find what I was looking for. Theory gets you close, experimentation gets you close to optimal.
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let me clarify my position
I'm not able to perfectly "optimize" - no track or dyno
but in line with this thread I am looking at simplification of the exhaust
header will remain unchanged and I will keep a muffler
but I'm looking at reducing the long and twisted path of the exhaust
(it is crisping my wiring and rattling loose due to poor geometry)
so this is a very mild exhaust change compared to what your are describing
Can taking half the distance & bends out of a truck length exhaust help?
or is it too complicated to make that call without a dyno
(BTW - I would be retuning the ECM to match after any change)