even a stock 5 port should go 10 with the right pipe, these are the pipes i run that will go 10 min on my engines

086
2050
2060
2047
also i run a 6.5 and 7 mm carb insert. Chris Pace runs stock and modded 5 port and go's 10+, even on really big tracks, get the tune right and drive smart and you will be good to go.