What is everyones on opinion on running 6s in 1/8th buggy class. is that to much battery or should i go 4 or 5s?

yes in my opinion too much. 4s is ideal. I've seen people run 5s but thats still too much (in my opinion) especially on a more technical track.

bashing with 6s sure! but not racing

A summary from many posts I've read in the electric 1/8 conversion thread...... (a lot of valuable information can be found in that thread)

power = voltage x current

With 6S, you are increasing the voltage, so you would run a lower KV motor (1300-1400kv) which will draw less current and produce less heat. A lot of people are getting longer runtimes and lower motor temps by increasing voltage.

If you were to run 6S on a 2200-2600KV, you would have ridiculous power and equally ridiculous motor temps! Not at all a combination suited to racing!

I've been running 4S with a 2550kv motor but I am about to go to 6S with a 1300-1400kv motor to further reduce motor temps and perhaps even see longer runtimes.

In terms of ROAR regulations though, I believe (don't quote me though) that 4S seems to be the 'agreed' upon standard. Doesn't affect local club races in Australia though, but may be an issue for larger events in the US.

1400kv on 5s is a good combo. A 2500mah 5s pack will go 20 minutes on an average outdoor track with that combo. I'm about to make the switch to that setup instead of my 2200kv 4s setup.

I ran 6s on a Tekin 1400kv. You get massive torque, better control, longer run times, and cooler temps. I went with that setup based of a recommendation but I didn't realize that I would never be able to run roar races. My next setup with either be 1700 or 1900 at 4s.