[Braden1]

Originally Posted by ecko04

People love stating that track mode is ”basically” straight piped, no it's not. Not even close to it. I am convinced that the people who say that have never heard a straight piped LT1 or a muffler delete.

In track mode, the valves still close. Also in track mode, the sound partially passes through one of the muffler chambers thereby quieting it.

If you want loud with an option QTP cutouts with the wireless transmitter are a great choice. You can still use your drive mode selector as you usually would and open the cutouts fully or close them partially. It's a muffler delete on demand, sounds great and won't break the bank.


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Has anybody done the QTP Cutouts that has anything to say about them? This sounds like a great alternative, because this way I could have full control over my loudest setting, and leave the rest factory.

Also, they look to install just in front of the factory muffler, I wonder if I could install them between the cats and resonators? Or in front of the cats?

[Umbriel]

Originally Posted by NeverDie

It's true, you are basically straight piped at that point....



...except for the cats, secondary cats, resonator, mufflers, etc.

Straight piped from the cats back, lol. No one is asking about removing the entire exhaust.

[Umbriel]

Originally Posted by Braden1

Has anybody done the QTP Cutouts that has anything to say about them? This sounds like a great alternative, because this way I could have full control over my loudest setting, and leave the rest factory.

Also, they look to install just in front of the factory muffler, I wonder if I could install them between the cats and resonators? Or in front of the cats?

I haven't heard it but it sounds like that would be the cheapest way to get what you are after.

[SSDan]

Originally Posted by Braden1

Has anybody done the QTP Cutouts that has anything to say about them? This sounds like a great alternative, because this way I could have full control over my loudest setting, and leave the rest factory.

Also, they look to install just in front of the factory muffler, I wonder if I could install them between the cats and resonators? Or in front of the cats?

I had cutouts on my 2010 LS3 mounted just behind the hi-flo cats - they were awesome! Of course the headers and cam helped a little.

To answer your location question - I would avoid mounting cutouts before the O2 sensors. If you do - you are asking for CELs and potential issues with the engine running right on a factory tune

FWIW - I really like the factory NPP. Its loud enough for me for when I want it loud and no drone.

[Braden1]

Originally Posted by SSDan

I had cutouts on my 2010 LS3 mounted just behind the hi-flo cats - they were awesome! Of course the headers and cam helped a little.

To answer your location question - I would avoid mounting cutouts before the O2 sensors. If you do - you are asking for CELs and potential issues with the engine running right on a factory tune

FWIW - I really like the factory NPP. Its loud enough for me for when I want it loud and no drone.

Headers and cam can always come later! Kinda thinking this might be what I’ll do. Just do cutouts after the secondary O2 Sensors. I don’t always want it loud AF, but when I do, I want it loud!

As for the factory NPP, it sounds awesome. I have no doubt about that. That’s why I was hoping to keep its factory sound on stealth mode. This will alleviate that issue, and give me the opportunity to keep my factory sound, with the option to be louder on the hot summer days.

[Boost Creep]

Get rid of all the noise reduction before the NPP system.
Get cat-less long tube headers.


If that's not enough, then look to a cam.

Another way would be find an aftermarket muffler that uses the NPP valves. In stealth it will probably be louder than stock, and track mode the same thing.