Anyone know what exactly gmbh did to the S4 engine to get 380HP?
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Kevin-
K04's, Intercoolers, Injectors, Airbox, etc. Internals are stock as far as I know. There are many S4's around with K04's, IC's, Injectors, etc. on stock internals that are making more power than 380 HP and are reliable.
Bruce
K04's, Intercoolers, Injectors, Airbox, etc. Internals are stock as far as I know. There are many S4's around with K04's, IC's, Injectors, etc. on stock internals that are making more power than 380 HP and are reliable.
Bruce
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