I've read several threads by searching and some people say 104's are 2 steps colder, some say 103's are 2 steps colder. I dont really know which to use, I am running a bolt on car with 45k miles, I'll be spraying a nitrous works 125 shot. I guess I should use 1 step colder to maintain regular drivability?

 

the 104's will be fine,use the 103's if you plan on going over 150.

 

thanks a lot for the info

 

I agree with Dirk. 103's are 2 steps cooler, 104's are 1 step.

 

my vote is for the 103's my car seems to run better NA with them too. I have melted a 104 on a 150 shot and the 103's have been good up to 175 right Derrick

 

funina91, Do you think the fact that you have a more built motor and I have a stock motor will affect that? All I have is boltons.

 

Nope I ran 7.50 on a 150 shot and bolt on's I am still on the stock bottem end with 122k miles on it I also ran the 103's with bolt on's