mmm, it will do good for your setup then
If you really want to take full advantage of it, upgrade from your 3inch intake to a 3.5intake- bigger tubing, and filter, and a Euro or 5 series 3.5HFM, a silicone throttle body boot at the right size (bimmerworld sells these for both the 3.5 and 3.0) and you will really be happy with your purchases
I think from a stock set up you could possibly see gains as high as 30+horses from your setup if you went the 3.5" route. (intake+tubing+HFM+silicone throttle boot+BIG BORE throttle body+straight pipes+chip... they all work together, and as has been mentioned many times, and are all synergistic (( they play into eachother, where you may only see a 2HP increase with JUST a CAI, you will get your CAI to jump up to something like 6HP if you do exhaust... make sense?)
Also... you will still have room to expand on this system and pull even more horses out of these mods... such as headers, performance coils, and bigger injectors (where there is more air, there needs to be more fuel, and where there is more fuel, there needs to be increased ignition)