Aftermarket turbos have been bolted on many NA diesels over the years with mixed results. Since the pistons are not oil cooled you have to be very careful as there is no room for error. If the EGT's get too high for any substantial amount of time you will melt your pistons. The generally accepted limit for EGT's is 1000*F post-turbo and 1250*F pre-turbo. A decent EGT gauge costs about $100 and will allow you to avoid damaging your engine. If the EGT's are kept below the limits then the engine should last a long time. RT

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