£916.68 £825.01 (ex VAT)

It's official, the recently-launched performance cat-back system from Milltek Sport for the BMW Z4 35i doesn't just look good it puts in a great performance as well.

Over several power testing runs on the SKN Tuning dyno in Germany, Milltek's Z4 development car showed a consistent average improvement of 13bhp and 19Nm of torque - impressive on an otherwise unmodified car.

One of the reasons for such impressive gains is, in part, due to the Milltek system replacing the restrictive secondary catalysts. There are four cats on the standard exhaust system, two primary and two secondary. The two primary cats are regulated by the engine's ECU control unit but the secondary cats are not so can be removed without requiring an ECU remap.

Through intelligent design, employing sensitively-enlarged pipework, flow-optimised silencers, smooth radius bending and, superior routing of pipework, Milltek have once again hit their target brief, they've always said: "If you can't feel the difference from the driver's seat, the product isn't ready for release".

The new Z4 system can be thought of as a complete sensory enhancement package, you get a proven power increase, sharper response to throttle input, a better sense of interaction between driver and machine and, a vastly improved aural character that perfectly compliments the performance credentials of the turbo-charged 3.0 straight-six engine.

The system is finished off with dual GT100 (4-inch) tailpipes that were selected specifically to look like they are part of the original design of the car and not to look like an after market add-on. While subtle, they do still hint at the extra performance on offer.

The Z4 exhaust system has it all, a genuine performance edge, sounds that are truly awesome, looks that are subtle but sexy and a feeling of true exhilaration.

You can download the dyno graphs in Adobe PDF format

Product Code: SSXBM936