My first foray into the market of turbocharger blankets was with the PTP Turbo Blanket intended for use on my Audi S4’s BorgWarner K03 turbochargers.
I figured that the turbine housing of the K03 was probably not significantly different than that other turbochargers I might soon consider using, BorgWarner K04’s, FrankenTurbo F21’s, SRM RS4 Hybrid, ProjectB5 RS4-X, etc, since all used the K04 hotside so that if I were to upgrade I might be able to reuse the PTP Turbo Blanket
After measuring the circumference around the turbine housing of the K03’s and a set of K04’s I found that they only differed by approximately 0.75″ which I believe is sufficiently close to not matter to how the turbocharger blanket performs.
Unfortunately the turbocharger blanket model I selected was not a good fit with the K03’s on the S4, more specifically in the area where the exhaust manifold attaches to the turbine housing. After monkeying around with trying to get the blanket to fit I decided that major surgery, such as cutting the blanket to get it to fit, was out of the question and I would return the model I had selected to PTP Turbo Blanket and investigate other models that they carry.
I also inquired with PTP Turbo about a custom blanket, which is something they offer, but they advised me that to produce a blanket for a single vehicle the cost would probably be unreasonable.
At this point I decided to expand my search to other product suppliers to see if another might carry something better suited to the BorgWarner K03’s.