[Lord M]

I was looking up info on how it works and videos of aftermarket axle-back exhausts and came to the conclusion that they're a waste of money. Ive found many posts explaining that, with the valves open its pretty much a straight pipe flow, and to silence it close the valves and the flow is forced through the muffler. When I watch videos and a proper comparison is done there's no real sound difference. I feel I should just get some tips and call it a day. Is the information Ive come across wrong, will an aftermarket exhaust give it a noticeable louder, better volume? I'm only looking to do an axle-back not headers, or any deletes.

[enzia35]

Eh, you'd be wrong there.

[VinnAY]

Originally Posted by enzia35

Eh, you'd be wrong there.

Agree

[VinnAY]

Originally Posted by Lord M

I was looking up info on how it works and videos of aftermarket axle-back exhausts and came to the conclusion that they're a waste of money. Ive found many posts explaining that, with the valves open its pretty much a straight pipe flow, and to silence it close the valves and the flow is forced through the muffler. When I watch videos and a proper comparison is done there's no real sound difference. I feel I should just get some tips and call it a day. Is the information Ive come across wrong, will an aftermarket exhaust give it a noticeable louder, better volume? I'm only looking to do an axle-back not headers, or any deletes.

This is not true, categorically not true. Your characterization of a straight pipe is also not true. I'm not going to snow you and think the NPP is some great thing because I immediately took it off my car for an axle back but it is not as you describe. Not to mention as a factory option is overpriced about 10X.

[arpad_m]

Originally Posted by Lord M

I was looking up info on how it works and videos of aftermarket axle-back exhausts and came to the conclusion that they're a waste of money. Ive found many posts explaining that, with the valves open its pretty much a straight pipe flow, and to silence it close the valves and the flow is forced through the muffler. When I watch videos and a proper comparison is done there's no real sound difference. I feel I should just get some tips and call it a day. Is the information Ive come across wrong, will an aftermarket exhaust give it a noticeable louder, better volume? I'm only looking to do an axle-back not headers, or any deletes.

There are aftermarket axlebacks that are louder and have a different sound signature for sure. The factory NPP is technically not a straight pipe, but it is significantly less restricted with the valves open, see pics in this thread: https://www.camaro6.com/forums/showthread.php?t=427570

Originally Posted by VinnAY

This is not true, categorically not true. Your characterization of a straight pipe is also not true. I'm not going to snow you and think the NPP is some great thing because I immediately took it off my car for an axle back but it is not as you describe. Not to mention as a factory option is overpriced about 10X.

Overpriced 10x with controllable (and tunable) valving, zero drone and settings integrated with the infotainment system at $895? Hardly. Volume and sound profile preferences are subjective, but this is a pretty valuable option IMO. The big suitcase that most detest even serves to smooth out air flow in the rear.

[red_johnny]

Originally Posted by enzia35

Eh, you'd be wrong there.

+1, easy to see (hear) going from sport or track to stealth.

[HWG]

well for me I can see a lot of difference , have Borla Atak axle back and the difference between from stealth to Track is huge ...

[SSJ455]

Listen to both first. I have the NPP and I love it!

[VinnAY]

Originally Posted by arpad_m

Overpriced 10x with controllable (and tunable) valving, zero drone and settings integrated with the infotainment system at $895? Hardly. Volume and sound profile preferences are subjective, but this is a pretty valuable option IMO. The big suitcase that most detest even serves to smooth out air flow in the rear.

You can't be serious.

(sarcasm)

[Dvs510]

Originally Posted by Lord M

I was looking up info on how it works and videos of aftermarket axle-back exhausts and came to the conclusion that they're a waste of money. Ive found many posts explaining that, with the valves open its pretty much a straight pipe flow, and to silence it close the valves and the flow is forced through the muffler. When I watch videos and a proper comparison is done there's no real sound difference. I feel I should just get some tips and call it a day. Is the information Ive come across wrong, will an aftermarket exhaust give it a noticeable louder, better volume? I'm only looking to do an axle-back not headers, or any deletes.

Put it in track mode and get out and go to the rear of car... try and cover both of the inner tips that people think r completely bypassed and u will feel that there is still pressure coming out of them.. and I too have a “straight piped axle back” and will agree like everyone else that it’s a huge difference over stock npp.. deeper, louder and overall better sound just like everyone says. I also did a dB meter before and after changing my axle back and it was I think a 12 dB difference..

[arpad_m]

Originally Posted by VinnAY

You can't be serious.

(sarcasm)

Pretty sure it adds at least 0.001 hp and 0.01 lbs of downforce

[Lord M]

Originally Posted by arpad_m

There are aftermarket axlebacks that are louder and have a different sound signature for sure. The factory NPP is technically not a straight pipe, but it is significantly less restricted with the valves open, see pics in this thread: https://www.camaro6.com/forums/showthread.php?t=427570

I now I see that there's no way for it to be like other posts Ive found. There's no way when the valves being open for it to completely bypass the muffler.

Originally Posted by Dvs510

Put it in track mode and get out and go to the rear of car... try and cover both of the inner tips that people think r completely bypassed and u will feel that there is still pressure coming out of them.. and I too have a “straight piped axle back” and will agree like everyone else that it’s a huge difference over stock npp.. deeper, louder and overall better sound just like everyone says. I also did a dB meter before and after changing my axle back and it was I think a 12 dB difference..

. I did try this after I read your comment, I've always had it in track mode. I went into the engine sound management menu and changed it to stealth. It almost completely cut out pressure coming from the tips with the valves. When I changed it back to track a lot more pressure was coming from the tip with the valve but still a lot from the inner tips.



Thanks guys, you two provided the most useful information, and provided me with something to back it up with.