Originally Posted by erics76

Come on now, we're talking about mufflers here. There are 1,000 posts about mufflers and no mufflers and exhaust systems on here a day. Mufflers have nothing to do with emissions.

Here's how the state of Texas defines a muffler:

http://www.txdps.state.tx.us/vi/insp...ejectsubmit=Go

"Muffler defined: Muffler is a device consisting of a series of chambers or baffle plates or other mechanical design for the purpose of receiving exhaust gas from an internal combustion engine and/or turbine wheels for the purpose of receiving exhaust gas from a diesel engine, both of which are effective in reducing noise."

Here's another quote pertaining to diesel emission systems:

http://www.txdps.state.tx.us/vi/insp...ejectsubmit=Go

"NOTE: The inspection of the exhaust emission system shall not apply to motor vehicles altered and modified to use only a fuel other than gasoline."

And one more:

http://www.txdps.state.tx.us/vi/insp.../item_insp.asp

"Diesel powered vehicles and motorcycles are exempt from emissions testing, but are still required to have the annual safety inspection"


Federal law may supersceed state law, but when you get your vehicle inspected in Texas, they will be using the state of Texas guidelines to inspect the vehicle. So in reality, federal law doesn't supersceed state law in this case.

Originally Posted by JKM

Good research , but , do me a favor , call the the feds , tell them your name , address , phone number ETC, then inform them that you have removed your stock exhaust in favor of one with no catalytic converter , and no muffler. Let me know the results

Originally Posted by gmctd

Ever heard of the internet? Instead of getting 2nd hand advice here, check the Texas DMV\DPS guidelines on-line - no 'friend of a second cousin's third wife's dog' advice on that 'site..................

Originally Posted by GasganoFJ60

In Texas, a turbo is all you need...says Texas DOT...


http://www.txdps.state.tx.us/vi/insp...ejectsubmit=Go

Originally Posted by Ryan Hyatt

YES it is illegal...most cops wont mess with you unless your an obnoxious teenager (which is my problem) buy yes its illegal to have no muffler, if your truck came without a cat then its legal to have only a muffler but you cant switch it around. And most inspection places wont mess with you on it. You can also get a ticket for disturbing the peace because your exhaust is supposed to be under 85 decibles and with a str8 pipe you will well exceed that.

Originally Posted by 10-95

Thanks very much for the post. It's not the "law" per se, just the State's instructions to MVI inspectors, but at least it gives me something to work with.

Fed guidelines = worthless. Never heard of a federal police officer out making traffic stops so fed guidelines don't amount to squat. State police & local police don't enforce federal guidelines either so I guess fed guidelines are a moot point.

Really I just have a pint of Scottish ale riding on that question and I can muddy the waters enough with it for me to win.........