Assuming that the Dinan essentially ends the OEM warranty on the power train, I would think that it hurts resale. I have heard there can be problems relying on the Dinan warranty.
The other issue is whether the original owner who installed the Dinan trashed the car during the 18K miles he drove it. People don't install Dinan systems to drive like a little old lady from Pasadena.
If you are looking to see if the dealer is offering you a good deal, I would think it would need to be a very good deal before I picked it up.
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