there is a guy with an I6 200 and he does the 1/4 mile in just under 14 secs...stock but only Nox...he can only do 4 1/4 mile races before the engine blows...he didnt say what the shot he used was but thats still pretty amazing..and it was in an old 4 door that weighed like 3000 lbs...i guess he used the 500 hp shot of Nox...i think thats the largest shot available...when running nitrous u need an electric fuel pump..make the gaps on the spark plug slightly smaller to compensate for the boost.....actually here is a guide to doing it yourself...
www.diy-nitrous.fsnet.co.uk