Sounds to me like your friend is scarred your car might be better (faster?) than his if you mod and he is threaten by it.
Honestly, most NA cars do not respond that well compared to a factory boosted car. Which for people who have them (factory boost) do not understand the balance of NA power v price v performance. It can be a bit costly for smaller gains, but at the same time it generates a different response in engine performance, sound, car dynamics, etc.
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