|
exhaust tone / sound, or anything that re-occurs in time is a collection frequencies of varying magnitudes
multiple frequencies can exist simultaneously
What we need is a Fourier transform, which is one of many math formula that usually a computer can use to convert the time based frequency signature into a graph which reports frequency magnitude for all frequencies from negative infinity to positive infinity, and theoretically this can be done electronically in a simulation environment as a digital sound signature and then mathematically selecting or 'filtering' (bandpass, lowpass, highpass, &c) frequencies which you wish to hear, of those that are present.
In a practical sense, its out of our hands. No way random people go through higher maths and experiments to select size/shape/damping exhaust. On the other hand, the OEM does go through all the trouble. So if you can use an OEM exhaust system it would probably give the "best" (quietest/lowest/highest/etc...) of the engine depending on the vehicle. Whatever the engineers selected and had the time for, I wanted to emphasize that there are few companies and surely no one-off installs which comprise the level of detail already invested into the majority of OEM units for most cars after certain years.
OEM exhaust for 240sx sr20det rwd 2.0L+ works until ~360rwhp on T25 frame turbochargers at 2,880lbs, after that it becomes noticeably harder to make more power, not impossible.
Less than 350hp OEM is ideal. The system on 240sx is identical to Nissan Silvia S14 sr20det rwd model 280rwhp
|