You don't really need a better performing set of coils for it, new oem Denso's are fine.
Aftermarket coils aren't aren't common, unless they are cheap replacements, which are usually a gamble, and you can make alot of hp with a turbo and still use stock coils without an issue.
And if you were to put a set of coils on with more output, you're not going to gain anything noticeable.