i never removed my bumper to install my mscai. jacked her up, removed the wheel, undid the wheel well and slipped the filter on the piping
sure it's a lot tougher to maintain than an sri, but for ppl like me who do their own maintenance it's really nothing. and it ends up being the standard 2 birds with 1 stone scenario anyway. next time i do an oil change and rotated i'll already have the wheels off and the car up so i can take the filter off and clean it, or stick a K&N on there if i find one to replace the oem mscai filter