An Exhausting Question
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 1,218
Likes: 2
From: Plainfield IL
An Exhausting Question
I'm considering installing muffler eliminators on my '86. However, I live in northern Illinois (Naperville) where cars must pass an emissions test.
Does anyone from the area know if exhaust noise (decibel level) is measured as part of the test? Also, if I leave my catalytic on the car but add muffler eliminators, will the car pass emissions testing? My car is in a good state of tune and has never failed the test with stock mufflers. Thanks for your help.
Does anyone from the area know if exhaust noise (decibel level) is measured as part of the test? Also, if I leave my catalytic on the car but add muffler eliminators, will the car pass emissions testing? My car is in a good state of tune and has never failed the test with stock mufflers. Thanks for your help.
Le Mans Master
Joined: Aug 2005
Posts: 7,201
Likes: 0
From: DP(oh you know where) IL
St. Jude Donor '06
Yea all mufflers do is muffle exhaust. Nothing to do with emmisions. As far as i know there is no decible test of any kind. Just as long as your exhaust doesnt have any leaks. As long as you dont mess with the catylytic converters you will be ok. Happy modding 
Le Mans Master
Joined: Nov 2002
Posts: 7,179
Likes: 2
From: Charlotte, NC
Originally Posted by Slammed Vette
There wasn't a noise test the last time I went.I have no mufflers and long tubes.
As far as I have seen they are not testing noise level yet. It may happen someday.
-=Rick
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 1,218
Likes: 2
From: Plainfield IL
Originally Posted by Humy
My Borla XR1s that look obnoxious passed no problem (I am in the Western Suburbs too)
Melting Slicks
Joined: Apr 2002
Posts: 2,341
Likes: 0
From: Addison IL
There was a bill that was due to be passed regarding aftermarket exhaust and noise. It was posted here very early this year. I called my State rep to voice against it, don't know what happened to it. If passed the folks at the emissions lanes had all the power to say too loud or ok. To my knowledge it has not passed YET.
Race Director
Joined: Aug 2001
Posts: 11,028
Likes: 5
From: Chicago (Naperville) IL
Originally Posted by Biker
I'm concerned about meeting/passing noise emissions standards. Are your pipes much louder than stock? Did you get any comments from the emissions testers about noise?
emissions tester said nice exhuast - and when i asked him to run it on the dyno thing, so the walls of the building would fall off - he wouldn't do it - passed no problem
---
the post right above this, the law was not passed... but they'll try again next year
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski