Question about items in Project M 3.5

[ProdigyX5]

If I wanted to replace the smoke ball with this

http://www.mediafire.com/?lwm5f1x91h4n8uf

How would I go about in doing so?
Would it require Brawl vault?

 

[Xermo]

replacing items in project m breaks the game. Common3.pac can't be modified without it destroying any pre-made changes.

 

[ProdigyX5]

Ok, thank you