Can a muffler affect wether i pass or not? I saw this system called the poor mans borla or something like that and its something i wanna try but dont want to if i have to change it back when emmission testing comes around.

 

Your damn right it does....

Some mufflers flow better than others and as a result they let out more Carbon. Which can make them ilegal in some places.

 

Muffler has no effect on emisions just sound, emsions test go by on measuring the volume of exhaust gas that comes out how ever much or little. I changed over from a stock to a flow master, the emisions readings were identical.

 

Heatmaker you moron.

If a muffler let out 1000000 CFM that is 5% carbon

and you replaced it with a muffler that let out 20 CFM that is 5% carbon.


Guess what, you have the SAME % carbon on your emissions report, which is what matters. You say some of the most moronic things, christ, 400 posts in under a month? You need help

 

Again...I speak from expierience only...Bad mufflers can cause carbon buildup and jack up your emissions test. So can Race only mufflers. They do not have as many flow reducers and can emote more Carbon out thier systems (Cause thier which are damn near straight pipes.) You forget that the CAT is only "Part" of the emissions system.

Anyone that Lives in NY or NJ could tell you same. As there are plenty of Fines and Restrictions behing handed out and passed down on vehicles. Sound has nothing to do with it. As I recall that's just one part of the emissions test.

Go disect a muffler and learn a thing or to how they work before you start blabbing your mouth. If you look on manufacturers websites or in race catalouges they'll state wether the muffler is 50states legal or not and "Sound" has nothing to do with it. There's plenty of Aftermarket performance systems that are louder than the illegal mufflers. As stated by Borla themselves "Thier Race only Mufflers are engineered to be quite."
I have an XR-1 muffler and it's quiter than my Original Borla Muffler...But it is Illegal in my state.

Each state has different standards and different test they run on vehicles. Up north Smog test are a bit stricter than everywhere else.

And for those of you who think the emissions test is only a "Sound test". Remove the "A.I.R. tubing and EGR systems from your car." then run through the inspection booth and tell me if they fail you for sound.


And why is that? Becasue there's no gaurantee that any muffler will always flow out 5% carbon . Why?....Because there's more to an Emisisons system than a Cat and a sound baffling device and the Muffler can either make it or break it.

been there done that....came again through the "Re-check line" and passed.

 

the AIR is to keep heat in your cats and mixes fresh air in with the exhaust. EGR keeps NX down by reburning exhaust. The Muffler has nothing to do with carbon, emissions, or otherwise. Sorry.


Moron.

 

Absolutely right. I've passed the sniffer with no muffler whatsoever. I've also passed with "race only" bullets. The muffler's sole purpose is to reduce sound. If your car fails because of NO or CO emissons, it isn't because of the muffler, it's another issue.

Hell, I've passed the sniffer with no AIR or EGR, for that matter.

 

"The muffler has nothing to do with Carbon?"

Have you ever looked down inside an exahust pipe?

yeah what is that black stuff?

umm yeah it's Carbon

Ever hear of a thing called

"Muffler Failure?"


You said it yourself.

"the AIR is to keep heat in your cats and mixes fresh air in with the exhaust. EGR keeps NX down by reburning exhaust"

These are just other factors of your emissions system that if fail can increase the amount of "pollutive gasses". And guess what? When they stuff that little tool up your pipe they will fail you.

And for anyone is saying they passed. State what State you passed in.

 

I'd yes, but its a miniscule difference.

Any increase in flow over stock is going to change emissions, but going from stock to a Flowmaster or Hooker, or some other "real muffler" won't change things much. But say if you've got a SLP Loud Mouth, Dynomax bullets, or no muffler at all, it'll make more of a difference due to more flow.

But if you've got a properly working cat(s) and your car is running fine and is tuned right, what muffler you have shouldn't cause a change in whether you to pass or fail.

 

Texas. Our sniffer tests are the same as California, NY,and NJ.

And just FYI, any aftermarket street legal part must have a CARB EO number and federal identifiers. This doesn't mean they have anything to do with reducing emissions, it means they don't increase them. That"carbon" build up is not what is tested for in emissons test, they test for hydrocarbons(a gas), Nitrogen Oxide(NO, also a gas), Carbon Monoxide(CO, again, a gas)and that carbon build up goes all the way to the tail pipes. The Muffler's sole and individual purpose is to quiet down the car. It's the catalytic converter's job to reduce these emissions, not the muffler. The only reason mufflers fail, as you put it, is they get clogged up from build up and back up the gasses and cause the engine to run like crap, this causes them to fail, not the acutal build up, it's the engine running like crap because of excessive backpressure. Period.

 

Don't know anything about this carbon build up or whatever he's talking about with mufflers , but my previous '90 Mustang GT and my current '94 Z has passed the sniffer here in NYC with no problems. I was running Flowtech's Warlock mufflers on my '90 GT, which are straight through (single chamber) racing mufflers. In my '94 Z I have Borlas with the middle size plate installed. Both passed with no problems at all. To my knowledge from what many have told me, the muffler serves almost no purpose in terms of emissions, but only reduces the decibel level. Hell, even the guy at the garage who was doing my emissions test told me the muffler does nothing except reduce noise and to not worry about it affecting the emissions test. I may be all wrong here, but I am also only speaking from experience. Just my $.02.

~~Wes