Originally Posted by
Shawn@Vadim
Sweet video, thanks. I *think* with the turbo and two (2) Ultra resonators, I'm gonna be happy with my exhaust.
With turbo (actual turbo not turbo muffler), you can run 0 resonators and a muffler and it will be quiet. If your wanting to run no mufflers, then two resonators (which are usually just round mufflers), should be sufficient, make sure the outside can is much bigger then the pipe though.
Originally Posted by
Kyle @Vadim @Shawn B
Round mufflers are louder because there is less packing material per volume than in a equivalent oval muffler/s. Also, the oval mufflers allow the soundwaves from the engine exhaust to interact with each other in a way that can cause sound wave cancellation thus, less noise. There is a reason why every OEM muffler equipped on cars has the oval design from the manufacturer. It is quieter by design.
OEM mufflers are oval because they need to be able to fit all the pipe bends, walls etc, I don't know if nissan guys have cut away their mufflers, so here is an STI muffler for an example:
Here is why round mufflers get bad rep, if you have a 3" pipe , your typical can is gonna be 3.5"-1". So you only have .5"-1 of padding. An oval muffler will have .5-1" ontop and 3-5" on sides. If you can find a round muffler with 3-5" all the way around you will be best off. There is an EVO guy who is running a 3 straight through exhaust with a properly sized round muffler and it is as quiet as stock, when he ran oval mufflers it was much louder. I might have to go find that thread again.
Originally Posted by
Kyle
The use of resonators in the systems helps out a whole bunch. I saw no mention of the use of resonators and that explains the angry bees in your video, Vadim.
Turbo mufflers should be looked into since they take advantage of this while still provided a free flowing environment.
In that video is with a Borla resonator 3" in/out, 5" can, it's listed in the youtube video description, just forgot to add it to the post above.
NA VE no resonator:
NA VE with 5" can Borla Resonator:
Back to turbo, same setup with 5" Borla can, sti muffler etc.