Go with the roush there is no need to spend the extra money on the K&N. Whatever you do don't put a turbo in it. There will be a lot of wasted power unless you have the money to install everything else that you'd need so just go with a supercharger. Regardless of brand you'll be dropping at least $1k+ on one unless it's used. Some of them are in the upwards of $6k. You don't need to spend that to get the same power though. Usually you'll just be paying for a name.