Mini engineers attempted to remove some turbo and boost noise by placing a muffler in the boost tubing. In the same fashion as an exhaust muffler is restrictive to performance, so is this muffled boost tube! The Alta Turbo Hot Side Boost Tube replaces the restrictive plastic and rubber OEM piece with a 5-ply silicone, fiber reinforced tube. With a mirror smooth interior surface, larger diameter and tapered transitions, you get a dramatic decrease in restriction and turbulence. You can expect much better boost response and more horsepower: Dyno testing has shown gains of 10 WHP and 10 Ft-Lbs Torque!
Notes from Alta:"After installation, we saw an increase in boost of about 1.5psi which carried across the entire RPM band except above 5700, where the ECU didn't like seeing this extra boost. This loss in HP can be cured with with installing an Alta AccessPORT ECU tuning device."