Depending on your personality, I'm sure this opinion will change easily once you hear how sweet it sounds. I reckon as long as you keep your stock intake bits, you could remove the SRI and fit the stock intake in under 10 minutes. I'm not 100% on the SRI/CAI subject, but I think I've hear things like an SRI can give you top end gains, but you can lose low end torque. Like I said, things like this are based on my shoddy memory so someone with more information on the subject should comment here. I have been experimenting with my own sri, and using different length of pipe, different pod filters. and I have found problems with torque ( no bottom end torque if too long) and no take off and top end if too short.even had probs with the trans, sloppy gear changes, holding in 3rd up hill.as of tonight ( yes been fiddleling again ) I put the first stock resonator back on and a short pipe ( with the maf ) and the pod. not as noisy but evens out the torque range and the trans went back to a normal mode. I have had the ecu update. even though this is good I think the K&N would be better because it was designed for the aurion. hope this helps.