Review on RKX 1.8T 2.7T Precision Diverter Valve: VW & Audi MK4, B6, B5, C5 1998-2005 (BLACK) by Julian Davidson

I was pleasantly surprised at the quality of this part. The workmanship was top notch, the mating parts fit together seamlessly and the build quality appears to be high. It is easy to install, although there is little space to work on my Audi A4 B6. I made sure to install this valve backwards as instructed in the instructions. Test drive the car after installation. The car seemed to pull a little harder at higher rpm, indicating a better internal seal than the stock valve. I cut open my old valve to see if it was damaged, but I didn't notice any cracks in the diaphragm. This suggests to me that the valve holds boost pressure a bit better than the stock valve, even at low boost levels. I think this is a worthy and even necessary upgrade for those considering increasing the performance of their VW/Audi vehicles by boosting their 1.8 ton engines.