Just wanted to touch on a few points about the TRUFit hose kit.
There are several factors which contribute to the short comings of the factory charge system. We have effectively managed to eliminate them using our TRUFit intercooler hose kit and the HFIP (high flow intercooler pipe).
The first factor deals with factory turbo outlet which is encased in a cavity just outside of the turbine compressor housing that has two large openings machined into it. These openings create turbulence at the turbo and slow down air flow almost immediately contributing to turbo lag. The turbo outlet also goes from a 1.75” opening straight through the outlet and dumps into a 2.25” hose without any transitions, this again creates turbulence because the air flow exiting the turbo outlet sees an immediate change in volume. The EuroCode turbo outlet creates a smooth transition going from the compressor outlet to a 2.25” opening without any openings cut into the adaptor.
The next vital component would be the TRUFit silicone boost kit. The 2.25” ID (Inner Diameter) of our turbo outlet adaptor was specifically designed to complement the ID of the hose kit. The factory intercooler inlet and outlets are also 2.25” hence our hose kit maintaing the same 2.25”ID throughout with the exception of the merger at the factory TB (Throttle Body), which has a larger diameter. This consistency ensures that the airflow confronts the least amount of restriction, thus equating to a higher velocity of compressed air as it exits the turbo.
The factory hoses are made out of rubber which is shaped using heat. This creates stretch bends, and also inconsistencies in the shape of the hose, and why the factory hose never carries a smooth and consistent radius like the silicone hoses (which are made on mandrel tooling for perfect consistency). Moreover, our multi-ply silicone hose will not allow expansion to take place during higher heat scenarios in comparison to the factory rubber hoses. This expansion as the rubber hose starts to soften, will create a pressure drop in the charge system and equate to additional lag.
The sound box or as we call it “the trap”, is eliminated using our HFIP (High Flow Intercooler Pipe). This pipe deletes this weak link of the charge system using a mandrel bent pipe eliminating the pressure drop. The less volume that is required before the air reaches the manifold the less turbo lag you will experience. Also by removing the sharp edges of the nipple right at the lower bend (as part of the factory pipe leading to “the trap”), we create a smooth surface that further reduce turbulence and drag.
Home brewed modifications that delete “the trap” fail to remove the sharp edges which creates turbulence at the radius of the bend. This opening couldn’t have been placed in a worse location, if the nipple was in a straight section of the pipe the problem wouldn’t be as bad. While under wide open throttle even though the box has been deleted it will continue to slow down air flow. Yet another weak link which needed to be addressed hence why we made a replacement part from scratch and not just supply a plug.
Our parts were put through a Computational Flow Dynamic (CFD) simulation before they were ever considered to go into production, and if they did not produce any change they would not have been manufactured.
Our hoses look dimensionally different from the stock ones, and this was done to enable a smoother transition which increased velocity. However the points at which they connect still remain the same, otherwise they wouldn’t mount into place. If a hose appears not to reach correctly, it’s because it is rotated slightly in one direction or the other, there should be no need to pull on the hose to clamp it down, rather rotate it so it sits in its natural resting position. If there is a ¼” gap, there is a problem somewhere, something is not lined up correctly.
Our hose kit will not increase horsepower in your car, nor will it have the same effect as putting an APR tune on your car with a 40+ HP gain. We only advertise a 200 rpm quicker spool reaction which it delivers. We also don’t recommend using home brew modifications in conjunction with our products to evaluate the performance.

By the way I miss my B8 A4.
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