[Nightfall1le]

I was wondering if theres a way to do a muffler delete while keeping the npp so i can still use stealth mode

[enzia35]

Read that to yourself again, but slower.

[Abubaca]

Read that to yourself again, but slower.

I'm going to HOPE that he just worded it wrong. ..One of those "I knew what I meant" moments!!!

[BlackbeastSS2]

Well there is a way but maybe not the setup you want but I did it to my 2016 2SS.

Delete the suitcase muffler. Add a y pipe just after crush pipes, then do two pipes out of the y pipe. Inside pipe with a muffler and out side pipe straight piped with the NPP values still operational. It worked good for me, louder then stock that’s for sure but it made my next door neighbour happy because it was not a full muffler delete straight pipe till I got a cam.

[Bohanan23]

hmm.. Delete a muffler that has valves in it to control loudness... Deleting muffler.. which deletes the valves..

[Abubaca]

You could also get a stock NON NPP muffler and install it straight up like factory. THEN....cut the valve portion on the stock NPP suitcase. Splice some cut-out "Y" pipes somewhere downstream of the cats and put the NPP valves in the cutouts. Extend the wiring pigtail to reach, boom.....there ya go.

[bubs]

If you want stealth + loud, put cutouts before your suitcase. Open it for free flow, close to push thru stock exhaust. I have QTP cutouts. Sound and video of opening here:

[zaimer]

The valves are technically not in the muffler, but they would have to be reinstalled if doing a typical muffler delete. It wouldn't make much sense to do what the OP has posted..

My first thought was doing cutouts as well, as bubs suggested. I have thought about doing those for mine but I'm not sure how it will sound haha.

[Alpha1BC]

I'd tend to agree with the cutouts idea. Similarly, you could do a little bit of fab and have the outer tips connect to the exhaust in front of the muffler using y-pipes. Basically cutouts but using the original valve locations and tips instead of aftermarket valves and/or exhaust dump locations. You'd need to keep the OE muffler to keep stealth mode. All stealth mode does is keep the valves closed all the time and force all exhaust flow through the full suitcase muffler. Deleting the muffler also delete's stealth mode lol.

[cellsafemode]

optional cutouts like this are still illegal in california and if you ever do get caught by a cop and told to see a ref, they will test exhaust in both modes and would be able to tell you have a cutout if you try and hide the switch if you rewire the valves for manual trigger. Our cars are already fairly loud, pretty much any aftermarket exhaust puts us over the legal limit technically. I wouldn't be surprised if even the stock exhaust goes over the limit. But santa ana is probably less anal than newport and such places.

NPP branches into two pipes prior to the muffler, one is a pass thru (the loud one) the other is baffled. If you want a muffler delete for your "loud side", just cut the pipe that corresponds to the pass-thru section. Cap it on the muffler side and retain the stock muffler.

Should be a very simple job with a exhaust pipe cutter.

[WhiteMale]

So you remove the muffler but want the NPP for stealth.

WOW.

[TheRealJA105]

Originally Posted by cellsafemode

NPP branches into two pipes prior to the muffler, one is a pass thru (the loud one) the other is baffled. If you want a muffler delete for your "loud side", just cut the pipe that corresponds to the pass-thru section. Cap it on the muffler side and retain the stock muffler.

Should be a very simple job with a exhaust pipe cutter.

This is incorrect, I guess you've never seen the NPP cutaway photo?

[gtfoxy]

Drunk posting this early Night?

Give me a few hours, I got some catching up to do.

[cellsafemode]

Originally Posted by TheRealJA105

This is incorrect, I guess you've never seen the NPP cutaway photo?

I forgot the stock has the valve post-muffler on the camaro. Been looking at charger exhausts where this kind of valve is before the muffler for the wife's car ....though even those dont split to separate pipes from the factory.. . just mostly how diy stealth cutouts tend to be done in them.

My bad.