I asked a similar question to them in email and the background is a solid sticker so if you got clear or a transparent color the background would just show through.
yesterday i took apart my intake trying to see if one of the 2 others i had would fit (one is from a 04 si and the other is PWJDM power chamber for a 92) neither of which would fit...but as i took apart i decided to keep the resinator off and with that is just sounds sooo much better!