Pagani and Daimler Together

While it is an independent company, 

Pagani has a working relationship with Daimler AG,

 most notably, with Mercedes' AMG arm.

 This is partly due to the fact that five-time Formula One champion, Juan Manuel Fangio had suggested that Pagani approach Mercedes. 

The Zonda has used increasingly advanced versions of the M120 V12; the initial version displaced 6.0L, but current Zondas use a 7.3L engine. 

Pagani has also assisted in the development of the Chrysler ME 412.

The M158 engine for the Pagani Huayra is shared with the Mercedes-Benz SL65 AMG Black Series.

 However, Pagani has commissioned Mercedes-Benz to reduce turbo lag and improve response, resulting in new exhaust headers, pistons, intake manifold and turbos.