I have had my car for 43,000 miles and never a cel. Works p2 flash for 30,000 miles with flawless operation. I recentley got p300 and p401 egr codes after the install of a TRE tranny and ralliart diif with an exedy organic street disc and prostreet flywheel. I notice significantly more chatter during decel than before and I'm hesitant to get the mitsu flash and then to have works reflash the p2 if this will not solve the problem. Solutions and feedback welcome.