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Did you notice any difference in the performance?
Yes, with the stock HE, I could heat-soak it after the 1st pull with the BT JB4.

With the AMS HE, I never heat-soak. The HE is a necessary component when running higher-than-stock boost levels, either with the BT JB4, or with a flash tune (i.e., Ecutek). After using the JB4 for over a year, I am now currently running an Ecutek tune with a 1.3 bar nap (~19 psi), and I have not experienced timing pull due to heat-soak.
 
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