I've heard coupla ppl needed to drill out a hole or two for better fitment. Others went straight on. Prob best to have the mating surfaces checked first to ensure flush fit.
Im assuming this is for gtst?
Also i think there may be one or two pipes you need to blank off.
There is also some wiring you need to extend for aac valve and cold start valve.
You can fit a bigger throttle body too. Saves faffing on trying to find adaptor plate.
You'll also need to make a hole for intake pipe to go through down to your fmic
I've got it outlined in my webpage somewhere.. I'll dig it out