Yeah it is kinda scary, but to date I haven't read a single complain about it, & some guys are lowered for sure.Talk to Sasha (Boosted performance mastermind), he's very helpful and knows his stuff very well.

If you're gonna supercharge, keep your cats. If turbo, ANY turbo setup, definitely get rid of them

 

What about states that require emissions and cant get rid of cats?

 

Get a dirty smog? lol that's what my buddy had to do for his jeep that wouldn't pass..

 

in our state they don't smell your exhaust. They just plug in OBII and run the car, if all sensors show good data they deem the car passable.
If it's an older car and does not have OBII than they smell it, or if it's old diesel you don't need emissions at all. I guess they are afraid you going to give all the workers at the station cancer if you step on the pedal in one of them old diesels.
In any case, you can make electric dump valves on the exhaust and dump it right after cats when you go emission testing so if they put a sniffer in the pipe, it'll smell nothing but fresh air.

 

You can run cats no problem but it'll cost you some performance. At the end of the day it all depends on what kinda build you have and what your goals are. Someone boosting their car to run 350whp will be fine, but if you're goals are 700+whp then cats should be your last concern lol

I saw a thread a while back on a BP kit, not part of their standard kit but they can add cats if needed