The complete performance package for both high flow and cold air for the Porsche 911 (991.1) Turbo / Turbo S! This kit is offered at a package price and contains our intercoolers and our high-flow Y-pipe together with hoses, accessories and everything needed for installation. In addition, our very popular intake hoses can be chosen as well, to make sure the engine works without restrictions. The intercooler kit and the Y-pipe are good products in their own right. Fitted together as one unit they give a lower intake temperature combined with increased flow and lower back pressure throughout the system, and therefore generate more power! - Lower intake temperature under the same test conditions: 37°C (55°C). 18°C lower. See the diagram below the product images. - More oxygen for the engine, less back pressure and better flow! - Air flow at 0.175 bar / 2.54 psi pressure drop: 835 CFM (607 CFM), 37% higher (do88 intercooler + Y-pipe vs OE intercooler + OE Y-pipe)! See the diagram below the product images. - Motorsport-grade bar and plate cores from the renowned Garrett, utmost quality. - 3D freeform-designed cast end tanks. - Specially designed carbon fibre air guides. - Lower pressure drop! See the diagram below! - Y-pipe made from 63 mm mandrel-bent aluminium tubing. - Y-pipe with a smoothly shaped, cast collector section. - The Y-pipe has 2 ports for methanol injection (1/8 -27 NPT). These are plugged on delivery if they are not to be used. - Supplied with high-quality silicone hoses and accessories for fitting. About our intercoolers: To genuinely distribute the flow across the whole core we use cast end tanks with verified flow. A well-designed tank shape is decisive for making full use of the heat transfer properties and for maximising flow. Flow and cooling also depend directly on the size of the core, so in order to use as thick a core as possible the upper air guides are replaced with carbon fibre guides designed by do88 on the basis of 3D scanning. This guarantees a fit both to the car's structure and to our thicker intercoolers. To maximise the effect of the heat transfer, these air guides are supplied with proper sealing strips against both the intercooler and the body, so that the cooling air does not take the easiest route past the core. The connections on the intercooler are a full 70 mm, to maximise flow and eliminate bottlenecks in the system. As a result, this kit is supplied with new hoses in all four positions, all designed and CFD-tested for optimal flow. The hoses at the turbo compressor outlet are made from a material with particularly high heat resistance, rated for 240°C continuous temperature. All in all the weight increase is relatively small given the size and density of the intercoolers and the fact that they are made entirely from aluminium. They weigh 8.5 kg per side compared with 3.1 kg for the original 991 intercooler. It is an increase, certainly, but one that is more than justified considering the performance upgrade this kit gives! About our Y-pipe: At the start of the development process we spent a lot of time working out which way of building the Y-pipe would be most advantageous, and in this product you see the result of our decisions and our development work! Our pipe has both very good flow and low weight, which we achieved by combining light mandrel-bent aluminium tubing with a high-quality 3D freeform-designed cast section for the more complex shapes. On the cast section we then chose to weld on CNC-machined connections for dump valves and crankcase ventilation. This design gives a large increase in flow with only a fraction more weight. Performance: As far as performance is concerned, the do88 BigPack gives a noticeable reduction in intake temperature! The graph below shows the difference compared with the 991 OEM. All data was collected with our AIM racelogger during five immediately consecutive runs. Full-throttle acceleration from 50-250 km/h in a Porsche 997 with stage 1 software. No cooling down between the runs, just full throttle! During all runs the air conditioning was switched off and Sport Plus activated. The tests were carried out as follows: First, five runs were made with the OEM 991 intercoolers fitted. Stop, quick change of parts on the spot. A few minutes of test driving and then five runs with the do88 intercoolers, in exactly the same way as with the OEM ones a few minutes earlier. The temperature reduction is striking - a maximum difference of 17°C. Cooling is important, but so is flow. After many hours at the drawing board refining and smoothing the end tanks, combined with a core to meet our requirements, we have a result that speaks for itself. The do88 intercooler kit MERA is far more effective in both heat transfer and flow. With our own Superflow SF-1020 Probench we have verified the flow as a complete system, with hoses and pipes, for both the do88 BigPack and the OEM 991. What you see is what you get - true performance!