For more than 29 years of continuous exhaust development and technical expertise are drawn upon to develop the ultimate Milltek Sport range of performance products, offering an ever-expanding comprehensive selection of performance exhausts which build on the successes of key marques like Audi, Volkswagen, Porsche, BMW and Nissan. As of just recently Milltek has been taking off in the Subaru marketplace.
Whereas the factory saw fit to endow the car with a system diameter of just 53.8mm, careful testing
led Milltek’s engineers to arrive at a bore 15% larger at 63.5mm, reducing back pressure and
improving performance. Mass was also a consideration from the outset, with the team seeking to
trim excess weight from the OEM set‐up – despite the desire to run a larger diameter bore
throughout. The results have been astounding. Two systems will be available upon launch; a
secondary cat‐back design that is some 10.5lbs (23%) lighter than stock, and for those that refuse to
compromise, a primary cat‐back design that saves more than 17.6lbs (27%) over the standard part.
On a car that is about refinement and light weight, these figures are encouraging – but they mean
nothing without tangible power gains to back them up. Thankfully, the numbers here are equally as
impressive. Under independent evaluation, the test mule recorded 168.2hp / 141.6ft‐lbs as standard
at the wheels. With the Milltek Sport secondary cat‐back system, it increased to 175.4hp / 144.6ftlbs
– an increase of 7.2hp (4%) and 3ft‐lbs (2%). With the primary cat‐back system, the car was able
to produce a much more impressive 180.1hp / 153.4ft‐lbs – an increase of 11.9hp (6.6%) and 11.8ftlbs (7.7%). For a normally aspirated car, these numbers are astounding.
With the ‘weight’ and ‘power’ boxes ticked, Milltek’s designers were also keen to ensure that the
system packed an aesthetic improvement too. A pair of beautifully crafted 4.5” GT115 single‐skin
tailpipes was the ideal finishing touch. Balancing a more aggressive demeanour with an ‘OEM+’
attitude, they are the perfect visual balance.
In a similar sense to the Y‐Pipe on the Nissan GT‐R, replacing the BRZ’s over‐pipe with the Milltek
Sport Over‐Pipe is one of the simplest performance modifications that you can make. This is mainly
down to the OEM part featuring numerous crushes, dimples and changes in pipe radius. The Milltek
Over‐Pipe not only features smooth‐radius mandrel bends and optimal pipe routing but it’s also
manufactured from a larger‐bore pipe – 63.5mm versus the OEM’s 53.8mm. Despite this, the Milltek
part is actually 33% lighter! Evidence again, if it were needed, that Millteks’ attention to detail on
the development of this system has been extremely thorough and complete.
The Milltek Sport Over‐Pipe has been engineered to fit both left and right‐hand drive vehicles and is
fully interchangeable with the OEM exhaust system and the Milltek Sport system.
Most Articles are written by Noah Levy.