Hi flow or none?

[ElDiablo Viper]

I have Sean's Hi flow cats and will be installing this week. I'm wondering what would be the downside of not having them at all?

 

[J DAWG]

I hear they reduce heat by about 80 degrees. I would like to get some also from Sean. I know they oval and round and in different sizes. Which one if any fits directly into the old place. Or will any of them have to be fitted by a muffler shop?

 

[ElDiablo Viper]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by J SMITH:
I hear they reduce heat by about 80 degrees. I would like to get some also from Sean. I know they oval and round and in different sizes. Which one if any fits directly into the old place. Or will any of them have to be fitted by a muffler shop?

<HR></BLOCKQUOTE>


I have oval which are biger and offer more HP. Those are harder to install. I woul not go to anybody that does not know Vipers.

 

[Jerry Dobson]

Downsides would be:

1)Smell and fumes
2)Louder
3)You will need to fix the O2 sensor issue.
4)Depending on your exhaust, you might shoot a flame out the rear end. This is cool but can melt the back of the car.

The ovals are big. (square peg in a round hole?). Rapping the motor can cause these to vibrate against the side sills in some cases. It's a tight fit.

Here is the deal, the original cats have a 90 angle pipe that is part of them, so none of them will "bolt on". You will need to cut the original cats off to save the 90 degree bend.

 

[J DAWG]

Thats my problem around here is finding someone who knows Vipers. You car has impressive rwhp at this point. I have Corsa on order and look forward to the added sound and power. Aren't the cats good for another 10 hp?

 

[MES]

I've had, Roe oval's, no cats, and R/T cats. The downside without cats is a louder all around exhaust, and MUCH louder popping upon deceleration, with possible flames shooting out the rear. Also a $10K fine if your caught w/o cats (don't matter if you have the sniff test or not) Possible fumes, although I didn't notice any. Hotter side sills w/high flow cats verses no cats.

 

[GTS Bruce]

NO cats =louder.No side sill heat.Warm but you can rest a hand on them.No smell.Need Apex syms from Jon B or apex(work perfectly).No flames,NO burned bumpers.Louder popping. Enjoy,Bruce