From my experience an SRI provided better throttle response, and no percieved increases in power. When I installed my CAI, I was impressed by the amount of torque I gained with it all over the place, including downlow, as long as my car is still moving I usually keep it in third gear and it pulls out no problems. I cannot comment on other types of CAI, since I only have experience with the CES one. But lets not bring the CES vs ALL debate into it again. Another thing to note, is that once your car is moving (40+km/h) the air outide and in the engine bay is the same...so if your in alot of stop start traffic, then maybe a SRI is not a good idea...