This card that comes with the new Imperial Aces expansion allows you to add two modifications to a ship instead of the normal limit of one. Can they both be the same mod or do you have to pick two different ones? Example: Can I do two Shield Upgrades?

Made the same mistake myself before my brother pointed out the answer was written on the card.

If you want to superbuff the TIE's health though, you can do Hull Upgrade (which is in Imperial Aces with Royal Guard TIE) and Shield Upgrade, which it sounds like you have. Similar effect to two shield upgrades. Can't think of any other mods you'd want two of beyond that.

Have you actually read the card?

http://www.fantasyflightgames.com/ffg_content/x-wing/news/imperial-aces/royal-guard-tie.png

Ninja'd by a few seconds.

From the printed card text:

You may equip up to 2 different modification upgrades (instead of 1). You cannot equip this card if your pilot skill is "4" or lower.

So no, they need to be different.

Edit: crazy ninjas!

Okay, you're right, my bad. Helps to pay closer attention. Thanks.

If you want to superbuff the TIE's health though, you can do Hull Upgrade (which is in Imperial Aces with Royal Guard TIE) and Shield Upgrade, which it sounds like you have. Similar effect to two shield upgrades. Can't think of any other mods you'd want two of beyond that.

That is what I will end up doing.

Stealth Device and Hull Upgrade work pretty well to keep an Interceptor in the fight also.