Lots of threads on CAI's, use the Search function.
FWIW, look at REVO or EVOMS CAI's. Ignore the "claimed" gains of all of them.
AMD are to be ignored, was/is a problem with their system I believe! ITG and VWR/APR are the same (all are closed canister CAI's IIRC), EVOMS have been around for years and are proven to work and the new REVO system is very good, I'm loving mine, look much better quality than some others too.
Sound? Revo or ITG (the old filter type Maxogen) for whoosh dish and EVOMS for cha cha cha.