My best friend has an 02gt with mild bolt ons (trottle body, cai, intake plenum ect.) About 70k miles. It has been well maitianed but recently started knocking around 3-3500 rpms. At first we thought it was from hitting his h pipe on speed bumps. But this weekend we had 2 mechanics tell him it was either a rod or wrist pin. What should he do now? He had the car up for sale before he found this out, now he either wants to patch it or quiten it down enough to dump on a dealer. Any suggestions would be appriciated. thanks!