So, I took my son's VX into the local dealer to get the headlight gaskets replaced, and while there I made the mistake of telling them it has been stalling occasionally. Approximately 20 minutes later, the service guy called me back to the garage, and he and the mechanic laid into me about all the BAD mods.
1) The K&N filter is BAD because is is oil based, and the oil causes severe problems to the sensors.
2) The PV muffler is BAD because it causes obscene pressures in the engine.
They even mentioned our BAD oversize Kumho tires. I was surprised they didn't send me to VX jail due to the convex mirror on the passenger side.
The funniest part was when they tried to change the headlight gaskets without replacing the headlights. They ended up tearing the gaskets and having to order another set.
Ah, the trials and tribulations of being a VX owner...