what do you mean?

 

there is not cat on a turbo setup car

 

why not?


most people with turbo setups use a catalytic converter still

 

^ there is no reason you can't have a cat and a turbo on your car at once. It might be a little farther down the piping, after the downpipe at least, but there is no reason you can't have a cat. Yes, it might be SLIGHTLY restrictive and a lot of times turbo/built cars are just track cars so nobdoy cars about their emissions anyway (thus no cat on a lot of high power boosted cars), but on a DD it's common.