I purchased this battery intending on replacing the OEM battery in the engine compartment. But the way and position of the OEM battery was installed from the manufacturer (2015 Ford fusion) pitting this battery in the engine compartment wasn't an option without a fabrication and labor intensive project. So I installed this inside the trunk. I'm running 2000 watts rms on a massive audio bp4000.1 amp with a massive audio hippoxl sub, kenwood exerleron 5 channel amp for the mids. Blasting the volume doesn't even make my headlights flicker on a stock 150 amp alternator. But I'm still planning on upgrading to a 200 amp alternator in the future. Excellent battery.