Stock vs high flo cats

[First Strike]

Wanted to know what would be the HP difference comparing stock vs high flo cats. 2002 GTS

 

[ViperJohn]

Probably 5-7 hp, can go as high as 10 hp.

 

[denniskgb]

also less heat inside the car

 

[Indy]

also less heat inside the car

True...makes a huge difference! That's the main reason I put some high flows on. And it adds some rumble to your exhaust. Don't think you'll feel the difference in power, but it's probably good for a few ponies.

 

[denniskgb]

Also less likely to discolor the rocker panel below the edge of the hood.

 

[Paul Hawker]

In the past, some Vipers could pass Calif smog with only a single cat. Some of the aftermarket replacement cats would pass smog when new, but after a few years…not so much.

 

[Indy]

In the past, some Vipers could pass Calif smog with only a single cat

Do Cal Vipers have 2 cats per side? Aircare (emissions testing) is pretty strict here in Vancouver, but we just have the one cat per side...

 

[Camfab]

Single cat per side.

 

[cubican]

If you get a HF metallic cat with a 300 cel count you will be fine, less heat better sound and few more hp...

 

[VIPER GTSR 91]

Less heat and paint color changes in the area, and weight savings plus sounds much better than stock.

 

[Indy]

You can't lose

 

[steve e]

No Cats, off road ECU = more power, side sills cool to the touch, sounds the way a Viper should. Depends on where you live and can get away with. The difference is so great, to me its worth pulling them off and put them back for Inspection, and for the record inspection is such BS, makes me sick.