I spent a small fortune trying to get more power from my motor. It is a 4.0 but what I am saying still remains the same. When I went to 33's I did everything I could to get back to normal power.
Full Borla Exhaust
Perf Disti full ignition kit
Jet stage 2 chip
K&N Cold Air Intake
It all cost a ton in the end. I'm sure it all helped, but nothing crazy noticeable. I finally had the money for an 8.8 so I regeared at the same time. Major difference!
Definitely worth the time and money to regear. All the money spent on the go fast goodies I probably could've ended up with a V8.
Lastly, what is this fifth gear you mention? LOL