Hey, this track was mixed by Dylan "3D" Dresdow, and it was covered in depth in the July issue of Sound on Sound Magazine. You can read the whole article online but you have to be a subscriber:
Secrets Of The Mix Engineers: Dylan ‘3D’ Dresdow
As for the drums in the track, this is what he said:
Drums: SPL Transient Designer, API 550B
“The main drum parts on ‘Boom Boom Pow’ were the 808 bass drum, a 909 clap, and a loop. I used the SPL Transient Designer to tweak the attacks of the drums. It’s stellar for punchy envelope compression on kicks and snares. A lot of the time when working on the album I’d mult the kick drum and mult the snare, compress them really hard, and roll off a lot of high and low end, so they became very mid-rangey, and I’d put a tight gate on them. I’d sculpt the attack in this way and would add this into the track. It made the drums sound very punchy. I also applied the API 550B EQ to all drums, mostly for yet more mid-range punch. The 550B is really tight-sounding, ideal for a song like ‘Boom Boom Pow’, in which I needed to have nice attacks on the kick. If a loop sounded muddy, I’d cut around 240Hz; if I wanted more woody knock, I’d boost at 700 or 800 Hz.”