Let's talk about deleting cats.

Jeffsss said:

I'm really considering this.
I saw a kit from ROE that replaces the cats with straight pipes and gives you all the hardware and correct fit.
I can only assume that once the sills are removed you'll need to cut the cats off?
how difficult of a job is this, seems pretty straight forward.. my biggest concern is taking the sills off/on and making them look like nothing happened.
having the car run a little cooler would be huge for me down here in FL.

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Leslie said:

I toasted my high flows so I just removed the cats and put a straight pipe. I had a viper buddy I trusted to remove the side sills, then we drove the car over to a muffler shop he uses.
I do have corsa exhaust still.
Cost me $50.
Sounds much better too.

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01viper4me said:

I literally just took mine off last week with the ROE kit. I am very novice when it comes to doing any engine work on my own and I was able to do this by myself. I recommend getting the cat simulators from them. I bought the XCalibrator from ROE and had them do a tune to make sure that my CEL would not come on; however, it comes on every time I drive it (takes 30 seconds to clear it so its no big deal). A couple things to consider. I recommend getting a high temperature muffler repair kit/tape to wrap both ends of the pipes once you fit them (unless you are going to weld the pipes). I had trouble completely preventing the exhaust from leaking out until I went and bought them. I also recommend going and buying 4 standard U style muffler clamps as they do a little better job of sealing the pipes than the clamps ROE provides. Other than that taking the side sills off is extremely easy. There are 12 bolts for a GEN II (2 under the hood, 4 under the door, and 4 under the bottom) per sill.
I am having a complete blast with my cats off as the engine now sounds like a Viper always should have!

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dave6666 said:

Get hi-flows and ventilate your sills. Works in the 115 degree summers we have in Dallas. Dave's sills = not hot. Car sounds badass with cats.

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klamathpro said:

GEN1 or 2? GEN1's sound too raspy with a cat delete on most exhausts and I've heard plenty of them, just too short a distance to the side exits. Honestly, I have high flow cats in both and love that they cut down any raspyness that catless tend to have. I have been told by many people, including owners, that both my Vipers have the best sounding exhausts they've ever heard. But if you are keeping the stock mufflers, deleting the cats won't sound too raspy on a GEN1, and not raspy at all on a GEN2, and will enhance the sound quite a bit.
When you go to cut your cats out, remember to measure twice and cut once. Leave enough slack for the sleeve to fit over and remember that the engine moves under load.

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Jeffsss said:

thanks, yeah, I do plan on getting sims. what is the xcalibrator? it clears the CEL? thanks for the tip on the muffler clamps, and yeah I planned on wrapping them, I didnt plan on welding so thanks for the tape suggestion.
thanks for the tip on the muffler clamps and

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Jeffsss said:

what are you doing to venilate the sills?

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dave6666 said:

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01viper4me said:

The XCalibrator is their plug in computer to check engine diagnostics as well as run tunes. It will read the Check Engine Light (CEL) and tell you what code is flashing, (mine is always the 0420 which is for the catalysts) and then you can clear the code so your CEL turns off.

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v10enomous said:

Just buy some straight pipes and clamps and use the spark plug non foulers on the rear sensor. I think this is the only reason that sell spark plug non-foulers these days... Ditch the rear mufflers too.

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Crank up the volume...

http://www.youtube.com/watch?v=_fDI0y5pWxw

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Jeffsss said:

sounds like a powerboat out of water.. haha..

I'll run no cats soon.. just getting opinions.. thanks for the pics/vids.. very entertaining.

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v10enomous said:

Best thing I ever did. It's like a different car without the hot sills and interior and it sounds great inside the car but forget about using voice commands on your smartphone... Great sound accelerating under load and even better when downshifting for engine braking... Over 5,000 miles now without a single CEL.

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speedracervr4 said:

He's running foulers...the silver things in his first picture.

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v10enomous said:

You need 2 non-foulers for each side. You have to drill the one that's directly on the sensor to get the depth for the sensor clearance and then put an un-drilled sensor on the first sensor. It just limits the exposure to the exhaust gas by reducing the surface area and backing the sensor out of the direct flow of the pipe.

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fe4snake said:

One question that I do have is that after the removal. I get more black carbon deposit out of my exhaust tips then when I had the cats on.Is this normal? Also due to my exhaust is all stainless steel I get more moisture from condensation during cold starts which with the carbon makes for a dirty garage floor. My wife is on my case about it. Is this normal if you remove the cats?

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