VT-VZ Exhaust What's Responsible For Drone

[bozodos]

I had read that it was there to induce a pulse in the exhaust system due to them being so quiet stock. I could be wrong though.

[paok_18]

I think it is a few things. How ever a major part is the quality of mufflers..
Ie: Xforce cat-back with the rear twin in/twin out muffler-resi drones.. How ever the same setup in DiFilippo does not drone..

[munz]

I think it is a few things. How ever a major part is the quality of mufflers..
Ie: Xforce cat-back with the rear twin in/twin out muffler-resi drones.. How ever the same setup in DiFilippo does not drone..

It might have something to do with length of the reso's, I measured my Diflippo (2.5in) and Manta (3in) reso's and both were 14in long.

Wouldn't mind knowing the length of other dual rear resonated systems that have drone or not, if any of you care to share?

[Mohit]

Will check the length of my Supercat rear resonator on the weekend.
So would the first thing to do is try a bigger (longer) rear resonator to reduce drone?
What about the two centre mufflers do they play a role in the drone caused?

[munz]

could possibly be the length,


but it probably will come down to the material and how good the glass is packed in the muffler

[IJ.]

It all plays a part, diameter/length/position in the pipe work, some cars run a Helmholtz style resonator (muffler looking thing T'd into the main pipe) to kill certain frequencies of noise, I built my own system for the Tonner out of Difilipo parts supplied by Darren to my sizes, I lucked out and must have gotten it just right as there is no Drone at all and it's easily within legal limits sound wise.

It consists of Difilipo 1.75" long tube headers 2x3" Hi flow Cats, small balance pipe just before the 2x long VE type HotDogs into 2x 3"in/out Offset Mufflers then 2x 3" in 2" dual outlet rear mufflers, I've been spoiled over the years playing with Turbo Cars that are easily quietened down by comparison.

[Angeldust]

my VR SS i used to have droned really bad. Was very annoying as it was in the 1500-2500 rpm range.

Every lsx car i've owned since (VX, VY II and now VZ) has had no drone problems. All had modified exhasuts/pacey's etc. Unfortunately
i've bought them all with modified exhausts already fitted so had no idea what was in it.

Actually, how do i tell what exhaust is on my car at the moment? is there anything to look for that will identify what brand/type all the bits are?

[Mohit]

So looks like I wasn't imagining the extra drone from when I last had the Supercat cat back on my previous LS1 car.
Spoke to the exhaust shop and he said there are 2 versions of the rear muffler, a quiet and a loud.
Most people ask for a loud system so they fit the loud rear muffler.
They are ordering the quiet rear muffler for me and will swap it over.
Let's hope it's as good as I remember from last time.

[wally01]

So looks like I wasn't imagining the extra drone from when I last had the Supercat cat back on my previous LS1 car.
Spoke to the exhaust shop and he said there are 2 versions of the rear muffler, a quiet and a loud.
Most people ask for a loud system so they fit the loud rear muffler.
They are ordering the quiet rear muffler for me and will swap it over.
Let's hope it's as good as I remember from last time.

I have a supercat cat back on my SS no drone at all sometimes makes you wonder if it is a V8 until you get up it not loud really not to me it sounds just nice ,but in saying that my kids hear me leaving home in the morning for work 7.30 am they like how it sounds so all good here ..

[BLACK 346]

I have a supercat cat back on my SS no drone at all sometimes makes you wonder if it is a V8 until you get up it not loud really not to me it sounds just nice ,but in saying that my kids hear me leaving home in the morning for work 7.30 am they like how it sounds so all good here ..

Some people seem to get quality of note mixed up with volume of noise. I like a good loud V8 like anyone, but would not trade loudness for a good quality deep note. How your car sounds outside compared to what you hear in the cabin is also a factor.

[Wonky]

Some people seem to get quality of note mixed up with volume of noise. I like a good loud V8 like anyone, but would not trade loudness for a good quality deep note. How your car sounds outside compared to what you hear in the cabin is also a factor.

Precisely! Plenty of loud exhausts around which sound shit! Raspy and barky. Plenty of volume but absolutely no quality. People stick their fingers down their throat after they've passed.

[bozodos]

I was thinking that was a little bit more to do with the inherent way LS motors sound; that said some of the US made GTO catbacks are the worst exhausts I have ever heard (XForce haters take note!)


The deepest I've heard IRL was another VZ L76 with a custom twin 3", wish I knew what mufflers were used in it.

[BLACK 346]

I was thinking that was a little bit more to do with the inherent way LS motors sound; that said some of the US made GTO catbacks are the worst exhausts I have ever heard (XForce haters take note!)


The deepest I've heard IRL was another VZ L76 with a custom twin 3", wish I knew what mufflers were used in it.

Doesn't the LS motors firing order make it sound unique as well?

[IJ.]

I was thinking that was a little bit more to do with the inherent way LS motors sound; that said some of the US made GTO catbacks are the worst exhausts I have ever heard (XForce haters take note!)


The deepest I've heard IRL was another VZ L76 with a custom twin 3", wish I knew what mufflers were used in it.

Mine is very "deep" rumbles at idle and matches the resonant frequency of the big Shed
(vibrates the tin sheeting)

[Wonky]

Doesn't the LS motors firing order make it sound unique as well?

Yep. Firing order is different to the old 5 litre motors which is why they don't have the same sound.