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it will probably run a little off if you don't get it tuned for the UEL. I wouldn't risk running it long term without a re-tune specifically for the UEL. it might sound better to you with the rumble, but it probably isn't running optimally and might damage something in the long run. it will also probably turn on the CEL since the turbo kit was meant for the stock headers which mean the O2 sensors/cats were not deleted and are still present.
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