The next stage in revolutionizing the performance of the 335i, beyond the Slip-On option, is the Evolution exhaust systems. These systems, which are made entirely of stainless steel or titanium, can save 12 kg or even a full 21 kg of weight, depending on the material. That we made no compromises can be seen in additional power and torque, but it’s not all about providing more peak power. There are also noticeable refinements to the entire rpm range and the power is delivered homogeneously. Reducing back pressure brings about improvements in throttle and turbine response. Evolution performance exhaust systems sound very sporty and reflect the formidable nature of the powerful six-pot engine. Complete the look with a set of two exquisite tailpipes in titanium. Warning: Cannot fit with genuine trailer tow hitch. THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.