Probably wouldn't hurt. I don't know exactly what threw mine off but with what you see in my sig, my A/F ratio was 18+ (dyno only read up to 18 and it shot up there at about 3K and stayed there through 5500). Dur, oh yeah it was my dirty as hell MAF, either way, probably wouldn't hurt to get it tuned.
I say at least get a dyno and see where your a/f's are. I got a mail order tune and I was pinging all across the board. I went ahead and got a dyno tune and gained around 8-10rwhp through the rpm band.