I don't know... I guess it could be left well enough alone. What do you recommend for a mechanical fuel pump ...stock or something with a bit more flow. I don't want to have to install a regulator if I can get by without it. I have a fuel pressure gauge that will be installed. I've looked at some mechanical fuel pumps and they range from 6.5 psi to 8.5. Whats the max before the fuel needs to regulated..anything over 7.5?