I would recommend the IC install. If engine life is a priority, the IC does add a measure of safety and will give you peace of mind when running above stock boost levels. Sure there may be a slight increase in lag but it will be minor and by no means will it make the car no longer enjoyable to drive. As for the exhaust, you could always just cut off the 2.5" section I'm running straight out the downpipe right now and it sounds like pure evil