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thanks..the power not too bad but, today i went under n checked the catalytic converters , the left rear driver side sounds bad inside when i tap it ...can that cause enough back pressure to cause that...it did throw a calalitic code too ,since i have all brand new bosch sensors too...it was at bmw dealer few month back for complete diagnostics and they found a vacume line cracked after doing a smoked test it was replaced tho...can it be a new one?
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