This paper quantifies how EU tariff cuts transmit to export performance among ECOWAS economies by embedding tariff variation into a gravity-model panel with country-pair fixed effects. Using logged trade values and multiple estimators (OLS, FE, RE, BE) alongside a Hausman test, the analysis isolates an elasticity whereby a 1% reduction in EU import tariffs is associated with roughly a 0.487% rise in ECOWAS exports. Robustness comes from cross-specification stability and diagnostic tests, translating into policy-relevant guidance on se-quencing liberalization to unlock extensive-margin participation and product scope expansion. While observational rather than experimental, the design maps tariff policy to export competitive-ness with transparency on assumptions and limitations, informing negotiations and preference schemes between the EU and West African partners