Outboard guns on 190s don't slow you down any. And while they last they double your cannon power. There is more to it than that, but in general take them!
Unless you're in the A8. Then take 30mm. They last for maybe 2-3 kills the way I shoot (I'm conservative) and you usaully have to be close. But MAN it's an instant kill! When you're out you still have crap-loads of 20mm and MG17 13mm (do NOT drop the 13mm, it's like 2x50cal. Great for pilot wounds, pilot kills, damage, long range shooting, and if you take a snapshot with only cannon but the target lives, had you used both guns it may not have.
P.S. Somebody said take the 2-gun package on the C202.
Trust me on this. Take the 4 gun package. Every bit helps. And you're literally hitting more rounds into the same spot with the 4 guns package, which means more damage to any given part, and means more destruction of parts, and more kills.
I flew in a HTH room a while back that had realistic settings for C202s vs P40Es. It was a hard fought game, but everybody on the c202 side agreed that the 4gun package was better than the 2gun package.
