The 2004-2012 Mercedes G55 AMG Kompressor is the most iconic, specific-purpose high performance offroad car ever built.
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https://www.supersprint.com/ww-en/supersprint-performance-sport-exhaust-for-mercedes-w463-g55-amg-kompressor.aspx
The M113, AMG V8 Supercharged engine has huge potential.
For some unknown reasons, the log-design stock manifolds and the 4-way catalytics are unbelievably restrictive, compromising peak power and torque considerably.
The Supersprint 4-2-1 tubular headers with the HJS Motorsport, high volume metallic cat system puts an end to all that.
It makes a huge increase in performance, + 85 Hp, + 110 Nm on a stock engine, + 100 Hp, + 150 Nm on a pulley-modified motor, and it lowers the thermal stress on the engine at the same time.
It also enhances the V8 sound to a new level, expecially when mated to the Supersprint R&L rear mufflers.
When driving, the difference against the stock exhaust is monumental.
This is best exhaust ever made for the Mercedes G55 AMG. Period.
As always, Supersprint makes Power, others make noise.