Not saying “your guy” is wrong but building in a margin of saftey is never a bad idea. Most people don’t use a fuel pump large enough to supppy just their engine, let alone an additional fuel supply for nitrous.
FWIW, my guy, now retired, ran a speed shop for over 20 years and ran an outlaw class with his blown Chevy. Knowing many police, including myself, have taken their hot rods there. He would never steer me wrong and he was the only person I EVER trusted to work on my car. No need for all the NOS controllers, always retarding the timing 2 degrees, no need for the purge valve either, blah blah. Others can do what they want
