Fellas, how much of a HP increase will I achieve with this planned setup. Also, tell me if I'm doing anything wrong here. I have a V8 98 vvti SC400 Lexus. I've already customized my stock exhaust system with 2.25" "H" piping all over, removed all resonators, and retained stock mufflers. It sounds pretty mean so far. The next mod I did was the custom BFI mod. I should be right around 300hp right now. Now I'm also thinking of removing the stock cats as well, which some say will increase about 20rwhp; is this true? The car should also run richer which I should probably get it tuned with a safc controller. Now how much louder will this be without the cats? Remember I still have the stock mufflers. I'm also throwing in a 75 shot zex nitrous wet kit following. Now will there be issues of adding a wet nitrous kit after I tune the car with the safc unit from having no cats, as I'm sure the tuning will be mostly leaning out the rich fuel mixture. How much extra HP will I be able to achieve with all this?