Random Tech Cat Question

[TedK]

Has anyone simply replaced the stock cats with the RT's and retained the rest of the stock exhaust?? If so, any problems, recommendations, etc.? I do not like loud exhaust, but cooler sills and weight saving are certainly good things.

 

[Racer Robbie]

Hi Ted,

We have replaced the stock cats with 2-1/2" ceramic RT cats on many cars has it does help get rid of some of the heat. To get rid of more heat I would change out the mufflers to our 2-1/2" system as the car will perform a lot better and will be only slightly louder than stock. We have used this setup on a lot of customers cars who want to get more performance, rid themselves of the heat problem, and do not want a lous exhaust. You can see this at out web site below.

Robbie

http://www.members.aol.com/AtroRacingTeam/PRODUCTS/AtRoRacingsProductCatalog

 

[jk]

Just did this exact thing the other day. Replaced the stock cats on my 03 SRT/10 with metallic substrate RT cats - the rest of the exhaust is stock. Sound is just a little louder and a much deeper lower tone. Sills seem a little cooler, but have not done much comparison there yet.

 

[TedK]

I wish you were closer so I could come hear the new sound. How is the drone with the cats? Did you check to see just how much weight you lost on the switch?

 

[jk]

I would say there is a very slight drone, not objectionable since I like the deeper growl the exhaust now has over the stock cats. The stock cats are a lot heavier - I put the stock cats in the attic and noticed they weigh a whole lot more than the RTs. I can go grab them and weigh the stock cats if you would like the info.

 

[TedK]

Thanks, no need to do that, we know the weight savings is there. I wonder if "drone" means the same to everyone. To me, drone is that certain tone at a certain RPM and throttle position that seems to resonate inside your head and drowns out all other sounds. Actually can be a benefit if the wife is speaking at the time.

 

[Racer Robbie]

When I weighed my stock exhaust it was 98.5 lbs.
With RT cats, no crossover and our side pipes it now weighs 30 lbs.

Hope this helps

Robbie

 

[Viper X]

The crossover will help kill the drone. I have yet to hear a side exhaust system that is "drone-less" without the crossovers.

If anyone knows of such a system, please let me know as I'd love to get rid of my crossovers.

Dan

 

[Racer Robbie]

Quote: "The crossover will help kill the drone. I have yet to hear a side exhaust system that is "drone-less" without the crossovers.

If anyone knows of such a system, please let me know as I'd love to get rid of my crossovers."
----------------------------------------------------------
I totally agree with you Dan, the crossover does rid the viper of the drone. I do not believe that most of the heat is caused by the crossover, but is caused by the factory restrictive mufflers and the cats. I have built a lot of different systems and they always sound better with the crossover installed.

 

[ILLSMOQ]

Thanks, no need to do that, we know the weight savings is there. I wonder if "drone" means the same to everyone. To me, drone is that certain tone at a certain RPM and throttle position that seems to resonate inside your head and drowns out all other sounds. Actually can be a benefit if the wife is speaking at the time.

That is my definition of drone. I have no drone with the Corsa Track with out cats and I had no drone with the cats. Just loud.

 

[JonB]

[/QUOTE] That is my definition of drone. I have no drone with the Corsa Track with out cats and I had no drone with the cats. Just loud.

[/QUOTE]



EXACTLY ! Corsa has engineered RSC (Reflective Sound Cancellation) and is the only one that has done so. This system ELIMINATES those annoying resonant-drone frequencies. If yould like to know HOW they do it, please call!

PartsRack worked w/ RandomTech to develop 2.5" bolt-on and 3" bolt on cats for SRT10 and GTS. We offer them in 2 hi-flow substrates, and we will quote you flow-bench tested flow rates. Simply drop your OE cats and bolt these up.

Waaay COOL........ and LOUDer and Mellow. No backfire.

THANKS !!

 

[FE 065]

I'd be interested in the flow rates of those convertors, since Random Tech's website doesn't divulge much CFM information other than saying,
"As an example, a 3" diameter 9000 series SuperStainless converter flows 502 cfm."

A 502cfm CAT on each of the two exhaust pipes isn't as high as it sounds. That'd only support up to 456hp without causing a loss of HP due to exhaust restriction.

But, maybe CATS by design/function are limited in maximum flow capability..?

 

[Racer Robbie]

Jon is quite correct about the RT cats. I bought a set from Jon at The Parts Rack and they fit and perform perfectly just as he said they would. I now have over 10,000 miles on them without any problems. They made a huge difference in power and in lowering the car of heat.

 

[FE 065]

Well, I wrote Random Tech myself and got some flow figures.

Their metallic substrate Viper convertor flows 598cfm, and their ceramic substrate Viper converter flows 426 cfm.


That would work out to:

A pair of their 598cfm converters supporting up to 543hp w/o HP loss due to converter restriction.

A pair of their 426cfm converters supporting up to 387hp w/o HP loss due to converter restriction.