a rebuilt motor its spose to be run in. and run in through a cycle of driving conditions and speed.
sluggish and loud at the front could be an exhaust leak..
but it struggling past 4000rpm can also be an induction/boost leak. and with the AFM and air leaks these cars run like shit..
so yeh id look at that as an option
is this guy selling it almost straight after the rebuild?? something sounds a bit off..
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