What's your experience with some of the aftermarket accessories available? Are these any better than the stock RA cat? Also what's the difference between a metal vs ceramic substrate cat?

 

just get a test pipe

 

metal i believe cost more than ceramic and the ceramic has more flow, that is why they put them on our rallis to save money on the cost. You dont need a metal one, was told at a muffler shop were I had work done @ that they restrict flow as soon as it leaves the down pipe, so I just ran Catless instead...

 

I didnt think there is any difference between a metal cat and a ceramic cat in terms of flow. I thought the ceramic just takes heat alot better than metal and is for higher heat applications such as a turbo etc.

 

Way more flow with a metal substrate then a crappy ceramic cat. I've done a bunch of tests on them.

Search username razorlab

- Bryan

 

right^.

 

Thanks guys. Someone I heard said that there is little difference between stock cat flow rate and an aftermarket accessory, confused me a bit...

 

..there is a big difference between our stock cats and a high flow.

call U.R. talk to daryl about it. then order the UR cat and down pipe.

 

What is the influence of a high flow cat on the sound (noise) of the car? I want a car that look and sounds as stock as possible.

 

you trying to trick people?

and audibly you will notice some difference. If you plan to keep the rest of the exhaust stock it wont get much louder.

 

I have a UR down pipe, UR high flow (steel) cat, and stock cat back exhaust on my Ralliart. Sounds pretty close to stock, except I hear the turbo whistling more than original. I had a complete UR turbo back, with the extra muffler (total of 3) and extra resonator, and it was too loud for me to drive, even after I put in $700 worth of Dynamat, Dynaliner, and Dynapad. The drone gave me a headache. Actually two. The one between my ears and the one sitting in the passenger seat (my wife). http://images.ibsrv.net/ibsrv/res/sr...milies/lol.gif Hence the original cat back went back into the car.

 

I just want to put an Wideband O2 sensor but would like to avoid any warranty issue, so I want to be able to easily remove any trace of it when I go to the dealer. That's why I want a other cat than the stock one. And since I want to buy a cat, why not buy a High-flow.

And the sound issue is because I don't want to bring too much attention on the car.

 

Thanks, then I'm probably going to go for the HFC in the next month.

 

I'm probably going the HFC route too And some engine mounts whilst I'm at it.

 

Alright, that does it. At some point, I am going to buy a HFC (Metal Substrate). I already have a pretty accurate anemometer and work with a reputable shop most of the year with an AWD dynamometer. We are going to get some before and after numbers. I am willing to bet that these things aren't as "high flow" as people think that they are. And if they are, myth busted.