Exhaust and resonators

[Superfly]

Wanna have a custom exhaust made with a deep tone. No ricey sound so to speak. This is where I'm lost. How do i go about picking the right resonator?

[jedi03]

looking at youtube clips or finding people with similar setup to you and see what they have...i like the HKS hi power personally

[Kingtal0n]

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

[CalebS13]

+1 for HKS Hi Power

[dorkidori_s13]

HKS sports exhaust... sounds AMAZING on both SR and KA. very low and bassy, does not drone at cruising speeds, sounds damn good at WOT too ;) also looks 100% stock too!

[S14DB]

Without getting into a lot of math or swapping. Get the longest resonator you can fit in the mid section. You may go to long and take out some of the lower tones you want but at least you will get all the high end raspy stuff you don’t want.

It’s hard to say more than that without knowing engine and turbo setup.