what are the main physics as to how someone can make their exhaust loud? besides cutouts? for example pipe size, muffler length, round muffler, oval muffler.... lol

 

im new to this so sorry guys

 

You can add an aftermarket muffler (Ex. Flowmaster/Magnaflow), or a cut-out like you said. a larger pipe size will give you better flow, and probably a deeper sound. With mufflers, usually the longer they are, the louder they get. You can youtube videos of the hemi's with different mufflers to listen to the difference.

Hope this helps you out...

 

Put a stinger on the back like the old VW's!

 

Also, the shorter the pipes, the louder they will be. This is why some guys do side exits before the tires instead of straight back and out under the bumper.

 

hehe my old VW had one of those. RIP bug. lol

 

Proper pipe size is important for performance, balancing between flow and backpressure, and will have some play in sound, but the real component that dictates sound will always be the muffler.

Mufflers can take care of the silencing chores by three major methods: Absorption, Chambering, and Reflection. Mufflers can use one method, or all three, to attenuate sound. There are also Resonators being used in most vehicles today. They always work by attenuating sound. The first step in achieving ear shattering sound, is to ditch the resonator(s).

Back to the muffler:

The absorption method is probably the least effective at quelling engine roar, meaning it is the loudest and the benefit is that "absorbers" are also best at letting exhaust gas through. Good examples of absorbers are the DynoMax UltraFlow, and the good old-fashioned Cherry Bomb glasspack. Absorption mufflers are also the simplest. They utilize a simple construction consisting of a perforated tube that goes through a can filled with a packing material, such as fiberglass or steel wool.

Chambering is another method mufflers use to kill off noise. For example, the Hooker Aero Chamber muffler is a straight-through design, with a catch. Instead of a simple, perforated tube, there is a chamber inside the muffler that is much larger than the rest of the exhaust pipe. This design abates sound more efficiently than your standard straight-through because when the exhaust gasses enter this large chamber they slow down dramatically. This gives them more time to dwell in the sound insulation, and thus absorb more noise. The large chamber gently tapers back into the smaller size of your exhaust pipe, and the exhaust gasses are sent on their merry way to the tailpipe. Problem is, most chambered mufflers "bend" the flow of the exhaust and that's where restriction and a lack of performance comes into play.

Probably the most sophisticated type of muffler is the reflector. They often utilize absorption principles in conjunction with reflection to make the ultimate high-performance silencer. Specifically, sound is a wave, and when two like waves collide, they will "cancel" each other and leave very little of the original sound left to hear. Again, that is why the first step to "ear piercing exhaust bliss" is to cut out the resonators before even tackling the muffler issue...

 

Pipe size/diameter, pipe length, muffler (alot to choose from and will give you the main or base tone of the exhaust), resonators, tips (if resonated like the old Borla ones I had), headers, and intake (when I added my intake to my truck the exhaust sound changed to a deeper rumble than it was previousely). Different combinations will give you a different sound/tone from the exhaust, do your homework and find the right combo to fit the sound you want.

 

some old guy tried to tell me the opposite? that the shorter the muffler was the louder?

 

I've always been taught the longer the quieter