Catalytic converters vs small resonators?

[olds307 and 403]

I have a Mallory 6AL box, 20 base, 18 mechanical all in by 2600 rpm and 11 degrees of vacuum advance. I plan on a wideband in the near future for exactly that reason, get the carb where it should be. Didn't GM program WOT on EFI and Limp Mode super rich on the CCC and probably EFI for the catalytic converter life?

 

[olds307 and 403]

I'm not sure I can fit cats where I want. I think changing the mufflers is the way to go for noise reduction.

 

[Supercharged111]

Have you looked at the spun cats? Just don't put them side by side.

 

[565bbchevy]

I'm not sure I can fit cats where I want. I think changing the mufflers is the way to go for noise reduction.

Have you considered installing inserts in the mufflers? There are a few different styles out there but I have Dynatech Vortex muffler insert cones in the exit end of my 4.5" Flowmasters on the Monte and it did help quiet it down a little.

 

[olds307 and 403]

I can get 2.5" Dynomax Superturbo's for $41 each, tough to beat and will sound good and be decently quiet.

 

[565bbchevy]

Have you considered the Flowmaster FX mufflers for about the same price and they are also stainless, I bought a pair of 3.5" straight throughs for my test run stand and I am curious how they will sound with the BBC but they seem to get good reviews on the sound.

 

[olds307 and 403]

Have you considered the Flowmaster FX mufflers for about the same price and they are also stainless, I bought a pair of 3.5" straight throughs for my test run stand and I am curious how they will sound with the BBC but they seem to get good reviews on the sound.

Yes, that was the other one I was seriously considering. They are straight through and Stainless. Holley rates them as moderate vs aggressive for the Aerochamber mufflers. About $30 more for the pair. I just know the Super Turbo mufflers will be quite enough.

 

[olds307 and 403]

I ordered the Dynomax Superturbo mufflers, I know what they sound like.

 

[Clone TIE Pilot]

If you're going with cats trying to get emissions compliant in the event that new legislation might get you jammed up in a smog test, it's gonna be a tall order to pass unless everything else is tickety boo as my Grandpa used to say.

A pair of cats installed compared to what your signature says you have now is gonna choke the crap outta your engine.

That Supra or Mikey's Hellcat and their forced induction has huge power so the performance loss with cats is not a factor. Your horsepower level makes a difference in this discussion.

A dual exhaust, even with dual cats is still emission illegal. Only legal exhaust for G bodies are single cat split exhaust, thanks to Bush Sr. If you already deleted everything, running an engine that is older than the body, larger than stock CID options, and/or a truck motor in a car, its pretty hopeless to be legal.

 

[James Morris]

Fuque both of those clowns. I delete cats and giggle the whole time.

Nice set of Borla for the win.

You must like the stink.