My friend totalled his car a few weeks ago and I am planning on trading him some parts. I can get the SLP Flowpac for his 00 T/A for like 250 and I was going to trade him that for his rear hatch ( he had a T/A while I have a Formula) which is already painted white and his K&N CAI since I still have the stock Air box. Should I do it???

I have a ram air box but probably wont get a hood until mid-late summer. How much of a power increase would I see with the CAI and the mods I have in the sig??