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JB4 or JB+ can make good power if you have the octane, the issue is they tell the ECU it has lower boost, as the ECU run speed density at higher loads, the ECU thinks the load is lower then it really is and therefore it runs more aggressive timing and AFR then it would normally at the load your really at
lets say the stock ECU would normally target 9 degrees at 200 load, but at 150 load it targets 14 degrees, you end up targeting 14 degrees of timing at 200 load, that is similar to an OTS BM3 e30 tune!
however if you do not have the octane, then things start to go bad with a lot of timing corrections and even broken pistons.......
So just know, the most boost you apply with a piggy back, the more aggressive timing you effectively apply, so make sure your fuel is appropriate for what that timing is, log it, check for timing correction, and if you see more then a few per 3rd gear ramp run back it off
also need to watch your AFR and trims, if you trims reach >35-40%, I would not go higher then that either, and fi you AFT is pegged at >14 also be more careful with your fuel as well as you will be much more prone knock
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