Catalytic converter questions

[Jaden]

replacing the exhaust and need to find out what the difference is between a 2 way and a 3 way cat, also I heard that if you run a catalytic on the street you dont have to have a muffler and still be legal............any help or advice would be greatly appreciated.......also air injection to the cat instead of the exhaust manifolods......."legal?"

BTW plan on going single 3" for simplicity and performace

 

[BlazerGuy]

Is it not legal to run just a cat and no muffler. I did this when I was replacing my exhaust and the cat has no muffing capabilites at all!

Murphy's Laws on Life :
"Leftover nuts never match leftover bolts."

 

[ftn96]

Well, the "legal" issue sill depend on which state you are in. Here in Tn, Im not sure if it is or is not. But thats the way I have mine setup and it isnt loud. And I've been through 2 emissions tests and they didn't say anything.

Just call your local muffler shop and ask them.

Will work for beer, parts and tools.
90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
<A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>

 

[CrazeeBush]

Here in TN I'm almost positive it's legal. A buddy of mine just had his newer model pickup have a split exhaust put on after the cat, no mufflers. Sounds damn sweet! The guy told him it's all legal. Mine is hacked off after the cat, and I haven't had any troubles.

-JoSH
[email protected]
<A target="_blank" HREF=http://josh.coloradok5.com>http://josh.coloradok5.com</A>

 

[Executioner]

FYI muflers dont change the emmisions one way or the other, as the name inplies they muffle the sound, not the
emmisions.Your state may not have a state law but I will bet you the Federal law does require a muffler, also
just becuase they don't always enforce laws, does not mean their is no law.
Good luck

 

[ftn96]

Ok, so what about his first question????? Difference between 2 way and 3 way???

Will work for beer, parts and tools.
90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
<A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>

 

[Triaged]

I think a 3-way cat takes care of NOx, CO, and HC’s while a 2-way takes care of only two (CO & HC). I think a setup w/ 2-ways is used on some F*rds (some of them use 3 cats and if in need of replacing you must do all 3 at once!). Most of the ones I have seen are the same price so just by the 3-way. But either way your muffler shop will have the answer.