W-H-A-A-T? You made a manhole cover come out of its socket? Geez, I never heard of that before.
Sounds like you are ready for a new (used) exhaust. Only a full exhaust will add performance, unless you get a Cobra 4-4. No scavenging, & your power will be
lower than stock. "Just say, 'no.'" Yes they look 'pretty.' I've had Kerker, Mark's, and UFO 4/1's. Your choice. They will need tuning (Sean Morley's jet kit or a Dynojet Stage 7, but don't get rid of your butterflies if you go Stage 7, just unplug the stepper motor connector when the VBoost cycles-open when you turn on the ignition switch, it's the round connector under the left aluminum scoop). Retaining your VBoost function makes it easier to synch the carbs.
I dunno if you're gonna hang onto it for awhile, and how much $ you intend to spend, but getting a new rear wheel in 17" or 18" allowing you to run radials is the biggest handling improvement you can make in my opinion, I've had my first VMax 24 years. You can use the front wheel for a radial although the width isn't optimum for a radial.
I suggest riding it for a season and then making a 'priorities' list, discovering what budget you need to fund it, and then executing the plan.
'RaWarrior' made this sticky, it answers many questions, and points the way to researching other posts about your questions. Try the 'search' function before asking, 'what kind of oil should I use?' You have many hours of entertainment via reading about your new bike, and what can be done to/with it.
http://www.vmaxforum.net/showthread.php?t=21240