Originally Posted by etlsport
you got it.. if you get the correct size resistor.. you only need one per side (easiest to install in the tail lights probably).. after that you could add a bunch of LEDs later and it shouldnt affect your flashing speed significantly

That is exactly what I did, and still have working LED's throughout entire VX and one resistor per side attached to metal behind rear tail lights, works great.
X2 I'm LED all the way around and those resistors work fine.