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Ok so i have 6-speed basic BPU setup with with BCC and all. My problem is now when i boost up to about 1.1 to 1.2 bar the car feels like its cutting out as if its not getting enough fuel. Most of the time when it cuts out black smoke starts coming out of the exhaust. Before it would boost up to 1.3 without a problem. Any ideas on whats up?
 

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definitely change the plugs, what ones are you running now? when i was running stock plugs at BPU the car broke up a ton above 5k rpm. I run NGK 6097 plugs now gapped to .028 and have no breakup at all.
 
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