My car does not redline as quickly as it did before?

If you find that the RPM's hang longer during shifting ( and this could very well also be the cause of the slower engine revs' ), it is often due to a build-up of deposits in the throttle body. Take a look at the underside of the throttle plate. It is probably caked in deposits which build up over time ( from the EGR valve ). If this is the case, get some Seafoam or combustion chamber conditioner and clean it out. If you do this service, it does make a mess of the oil and spark plugs so you'll want to change those after cleaning the TB. A lot of the time, it will also trigger the CEL ( Check Engine Light ) due to a misfire code. You'll have to erase that as well.