Hey guys, I have a custom muffler delete with two 2.5 inch pipes replacing my stock muffler. Identical to AAM short tails. Along with that I also have un resonated test pipes instead of cats. everything else is stock and my car only has 2900 miles on it. I was wondering why the sound changes so much at 5k+ RPM then when it's at 3k-4k RPM. It goes from crazy loud to just sorta loud with no growl or rumble it rasp. I wana know what I could modify to get it to growl at higher RPMs . Resonator delete? Aftermarket muffler? Help please

 

Please don't make new threads if people don't answer your previous one. It just clutters up the site.

I'm not a fan of muffler deletes, so I cannot comment on how to make your exhaust even less refined. I suppose if you wanted to make it louder, you could just run open headers and dispense with any pretense of an exhaust.

 

Because you're doing it all wrong. I'm sure you are losing torque, and probably horsepower as well, from that setup. The muffler is what helps to define the sound of a car, and you eliminated that portion of the exhaust. What you are left with is the raw sound of the engine, which apparently isn't what you were looking for. A G37 with a nice exhaust setup will rumble/growl through about 3-4K RPM and then scream to redline. Looks like you lose the muffler/cats and you lose the wonderful sound that exits the car from about 5K to redline.

 

When your RPM exceeds your usable torque the engine will not be under such a load as it took to get up to that point. The result is less "noise". Higher RPM doesn't equate to more noise up to a certain point. My exhaust note falls off after the 7K range.

 

Thanks for the heads up. I'm new to the forums so I wasn't sure where to post. And it's not about the volume, but instead the amount of rasp heard at higher RPMs

 

Rasp is the natural noise of the motor, if you want to get rid of it, you have to resonate it out. More resonators, not less, will get rid of it.

 

Yea I agree about the torque loss because It doesn't hardly respond to the gas pedal on automatic mode after the muffler delete. I still sounds really good though. I was just wondering if I got an aftermarket muffler, will the sound be silenced more?

 

I like the rasp, but when the engine revs up there you don't here the volume and rumble heard at 3-5k. maybe it's the muffler delete. Can I post a vid so you can see ?

 

That is what I was trying to say, you just said it much more elegantly, lol. What I meant was that you get a very deep/throaty sound up until about 4-5K RPM, and then by "scream" I meant less deep, more of the engine whining. He loses the engine whining, "screaming" part due to the rasp from his non-resonated exhaust.

Edit: Reread your post, got it. Maybe the RPMs I stated is when that typically occurs for me then.

 

exactly! lol. I never loose the "screaming" though. It starts at about 5k RPM when the growl is lost.

 

That screaming would be your intake.... Just because the exhaust looses its tone a bit doesn't mean that the engine at that high RPM isn't gulping down massive amounts of air.

 

I slept on it and my refreshed mind would like to rephrase my statement once again.

Rev.3

When the engine is under load, you get a very deep/throaty sound. When the engine is not under such a heavy load, you primarily hear a mild exhaust note and a more pronounced intake sound.

Thanks Warped Ideas, lol.

 

De nada, mi amigo. Just doing my part!