Surprised by GXP Exhaust on 2.4L

[Shadofax]

Originally Posted by RedDevil You basically just said the same thing I said in a different way. The sound however still sucks on the 2.0ltr. Needs more growl. Probably why it sounds louder on the 2.4ltr.

Not exactly. Excuse my pickiness, but you merely stated a true dual exhaust would have 2 entrances on the muffler, which could very well mean single exhaust from motor that splits to 2 at the muffler, not a dual exhaust IMO. I wouldn't mind a more sinister sound, but then again I can't help but remember the sewing machine under the hood. I like it stealth, I don't want to advertise, I just like to win......I have a Hahn IC sitting in the garage now, can't wait to stick that in there since it's really kinda hard to see that mod.

[JRinKY]

The muffler from the 2.0 is smaller than that from the 2.4, since the turbocharger acts as a muffler. Lack of the turbo on the 2.4 means that the exhaust note is louder with the 2.0 exhaust.

Purely measuring by feel - with my hand in front of the outlets - the 2.0 muffler flows fairly equally from both. One reason for the lack of vapor from the left outlet may be the design of the outlet pipe, as the left side has a longer outlet after it leaves the muffler body. The cooler pipe would condense more of the liquid before it reaches the air, so less vapor.

[wspohn]

You don't WANT true dual exhaust on any inline 4 cylinder engine. The pipes all join before the CAT and after that any splitting you do is for appearance, not for power.

All this dual exhaust nonsense is window dressing - a single suitably sized pipe will give as much power as any number of added pipes will. Silly, IMO, to want to pretend you have a 6 or an 8 under the hood - kind of like wearing a codpiece stuffed full of socks or something.

[Treeman]

Don't hold back!

Sent from my SCH-I535 using AutoGuide App

[BANDITCAR]

Well I can say that increasing airflow to the engine with a CAI and leaving on the stock 2.4 single exit system was detrimental to the performance of the engine. Adding the GXP exhaust seemingly corrected the constant issues I was having.(ie. RPM drops below idle, backfire, irratic acceleration)
For my case, the dual exit exhaust is quite practical and not silly in the least. I finally have the new car responsiveness back that I remember and with a little added sound.

[ChopTop]

Is the new LTI, C7 quad exhaust receiving the same scrutiny.

http://emwgradstudent.files.wordpres...e-stingray.jpg

[JRinKY]

I put the RL exhaust on my car because I wanted a little bit more exhaust note and because I thought the car looked unbalanced with the single outlet. Something about the outline of an exhaust outlet on the other side of the car just looked "wrong".

I did not expect, and did not achieve, any additional performance.

I know that I prefer the look of twin exhaust outlets because I grew up in the era of V-8 muscle cars, when the dual exhaust became one of the features of a performance car. Is it useless ? Perhaps. But it is the look and sound that I like, and it was free.

I think it is a pretty arrogant reach for anyone to assume anyone else's motivations for doing something. Now, if I had put a V-8 logo on the rear fascia instead of the 2.4 ..........

[Shadofax]

Originally Posted by JRinKY I put the RL exhaust on my car because I wanted a little bit more exhaust note and because I thought the car looked unbalanced with the single outlet. Something about the outline of an exhaust outlet on the other side of the car just looked "wrong". I did not expect, and did not achieve, any additional performance. I know that I prefer the look of twin exhaust outlets because I grew up in the era of V-8 muscle cars, when the dual exhaust became one of the features of a performance car. Is it useless ? Perhaps. But it is the look and sound that I like, and it was free. I think it is a pretty arrogant reach for anyone to assume anyone else's motivations for doing something. Now, if I had put a V-8 logo on the rear fascia instead of the 2.4 ..........

I don't think anyone was going there John? No one was posting up the "big gains" they got from the dual exhaust tips, and I think most agree the car looks better with dual tips, so most people were just posting on the desire for looks as the reasoning they did it.

[Rusty Boltz]

Originally Posted by wspohn You don't WANT true dual exhaust on any inline 4 cylinder engine. The pipes all join before the CAT and after that any splitting you do is for appearance, not for power. All this dual exhaust nonsense is window dressing - a single suitably sized pipe will give as much power as any number of added pipes will. Silly, IMO, to want to pretend you have a 6 or an 8 under the hood - kind of like wearing a codpiece stuffed full of socks or something.

I agree. I can't help questioning the need for a dual exhaust on a 2 liter (or even a 2.4) 4 cylinder engine.

[Shadofax]

Originally Posted by Rusty Boltz I agree. I can't help questioning the need for a dual exhaust on a 2 liter (or even a 2.4) 4 cylinder engine.

guys, this is getting way off track. This started by me correcting redevil on what a "true dual exhaust" is. I don't think he ever was actually talking about dual pipes from the exhaust manifold all the way back. His interpretation was merely dual inlet into a muffler and dual out. I think everyone is aware it wouldn't make much sense having a true dual exhaust.

[kd4pbs]

The best reason for having dual exhaust: Being able to list "Twice Pipes" in your mods.

[JRinKY]

Shadofax : I don't think anyone was going there John? No one was posting up the "big gains" they got from the dual exhaust tips, and I think most agree the car looks better with dual tips, so most people were just posting on the desire for looks as the reasoning they did it.

Really ? What does this say ?

wspohn : All this dual exhaust nonsense is window dressing - ........ Silly, IMO, to want to pretend you have a 6 or an 8 under the hood - kind of like wearing a codpiece stuffed full of socks or something.

[Shadofax]

I took that to mean he was responding to this nonsense about true dual exhaust. Would be a waste to put a true dual system in probably any 4 banger. Course no one was suggesting this in the first place, it was just a misunderstanding on what a true dual exhaust really consists of.

So hopefully we can get back to the thread and people with 2.4 putting on the GXP muffler with dual tips.

[wspohn]

Nothing wrong with putting any number of unnecessary (in regard to performance) pipes on any car, if that is your preference. Heck, the manufacturers have been using nonfunctional scoops and aero elements for decades as a come on to buyers.

I just wanted to clarify that there was no performance related reason for it and then added my own feeling on the aesthetics, but I didn't expect anyone to agree with that last and wasn't looking to start an argument. Choices on that sort of thing are personal.

Latest superfluous styling driven exhaust tips now in the news:



The one that always gives me pause because it just looks unnatural to me is this one:

[SolNut]

The C7 has E-controls that take it from 2 to 4 outlets. The 3 holer has a siamese splice in the middle tube. And I agree it is 'different', but nicely built.

If heat wasn't such a problem , through the tunnel sure would make our under-car airflow more efficient.