High Flow Cats and Borla HP Increase?

[Fursty]

Well, I have had my viper for about a month. 98GTS. A previous owner had installed high flow cats and borla exhaust. What has this done to my horsepower?

Also, it has drop in K&N filters and I am looking to simply add smooth tubes. Will this give me a HP gain? How much?

Fursty

 

[BOTTLEFED]

well I don't think you are going to get an exact answer so here is an example that you can compare your setup to...

I had a borla exhaust and headers, no cats, k&n dropins, and smooth tubes when I dyno'd last
I put down 440hp and 471tq with that setup