Quote:
If there is temperature change in the exhaust due to outside ambient temps the speed of sound will change and the wave length will also be affected.
Frequency=Speed of sound/Wave Length
This may be a non-issue if the exhaust temps are not affected much by the outside temps.
my 2 cents
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This is true for the math, but the exhaust temps should be pretty similar despite outside temperatures. Perhaps a bit cooler in the winter but still pretty close. The side branch resonators cover about 15 points of frequency completely and then begin to lose a bit of efficiency. On my car it knocked out all the drone from 2200rpms through 3000rpms. I expect in winter for the car to make a bit more noise but probably not much. Can always report back when its cold outside.
