redmyst
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has anyone heard of this tuner before and have any information on it and its actual gains if any?
JB4 Turner

JB4 Turner

I've seen posts from a few people using it. Mostly positive, and good increase in performance on the Hurricanes.has anyone heard of this tuner before and have any information on it and its actual gains if any?
JB4 Turner
View attachment 190061
I've used a JB4 on my 09 BMW 535i (N54 inline 6 cylinder with twin turbo) and it worked pretty well. I haven't used it on any other vehicle though.has anyone heard of this tuner before and have any information on it and its actual gains if any?
JB4 Turner
View attachment 190061