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Message: [QUOTE="jetskier, post: 1362463, member: 968"] Have either of you ever experienced a p1247 (low boost) after extended exhaust braking with a heavy load in tow with a tune or these experimental tunes? I can't seem to figure out if it's from the hard climb or the exhaust braking on the back side of these grades. But it occurs shortly after both events. These were the GH off tunes. It's almost like the VGT is stuck open until the engine is stopped and the code is cleared. No other codes are present. If you give it too much throttle it would smoke like crazy with the boost maxed out at 16psi. I've since return to stock exhaust and put the H&S on-tunes for the time being until I can run in this configuration. I suspect it a combination of the tuning and lack of back pressure. The turbo functions fine otherwise. [/QUOTE]

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