The Weistec 4th Generation M3 / S65B40 ECU upgrade (2008-2013) Naturally Aspirated 4.0 liter V8 engine provides substatial gains across the entire powerband. Use the Cypher Handheld Tuner to switch between your stock tune and the Weistec tuning. Experience
The Weistec 4th Generation M3 / S65B40 ECU upgrade (2008-2013) Naturally Aspirated 4.0 liter V8 engine provides substatial gains across the entire powerband. Use the Cypher Handheld Tuner to switch between your stock tune and the Weistec tuning. Experience the best of both sides of your vehicle!
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