Eventuri Intake for BMW G29 Z4 M40iPower increase: 17-25hp, 11-20ft-lbThe MK5 Supra Eventuri intake is designed to provide a less restrictive flow path for the turbo while maintaining low inlet temperatures. Heat and volume are the most important considerations when designing an intake system for turbocharged engines. On the G29 Z4, the intake system is located next to the exhaust manifold, which quickly warms up the engine bay with the heat. High temperatures are detrimental to engine performance as the turbo would need to be supercharged with heated, less dense air, so the only way to keep IATs to a minimum is with a fully enclosed intake. However, this results in a restriction with only one air feed to draw air from. During development we noticed an additional opening in the wheel arch area and took advantage of this by adding an additional feed in our air box. In addition, our sealed airbox also features a gold reflection heat shield to minimize radiant heat transfer from the exhaust manifold. To maximize volume, we made the airbox as large as possible with a cutout for potential strut bracing. The stock folded intake pipe was replaced with a smooth carbon pipe that also has a larger internal volume with an initial internal diameter of 111mm (4.4?) and gently tapers to match the turbo inlet. The pipe provides a smooth path from the filter to the turbo inlet. Finally, we use a custom high flow dry filter that is ISO tested for filtration performance and has a larger filter area than the stock filter.Dyno TestingOur BMW G29 Z4 M40i intake was independently tested by AMS on a Supra (same engine) with downpipe and software. The tests were repeated on the same day with only the airbox swapped out for our intake. As you can see there is a power gain for a large part of the rev range with some areas showing gains of over 20bhp. This is the result of derestricting the intake path whilst maintaining low intake temperatures by keeping a fully sealed system.Another dyno test was carried out in the UK by Evolve Automotive using a downpipe and a Stage 2 software tune. This dyno chart shows the difference between a fully stock Supra and then with the stock airbox, downpipe and Stage 2 tune and finally with the Eventuri, downpipe and Stage 2 tune a maximum power gain of 25bhp. All runs were done with the hood closed.Each intake system consists of:Dual feed carbon fiber airboxCustom made high flow dry cone filterCarbon fiber intake pipe with 111mm opening IDCNC machined temperature sensor mountCNC machined breather adapterHeat shield with reflective gold backingLaser cut stainless steel bracketsSilicon couplers with OEM spec clamps