which is best to buy and will they hurt my engine

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2006 CRD Rusty's Spacer Lift
245/75/16 maxxis mudders
flowmaster race outlaw muffler

I dont think the engine is the issue, from what we are seeing can the transmission take another 40 ft/lbs with DC detuning the computer. That aside if my CRD holds up well through its warranty I might breakdown and get the Edge with the A1 so I can get TomTom as well.

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06 CRD "Smogger" Dark Khaki, Sport, 22C, tow package, hitch, 6 disc and slightly addictive SIRIUS sat radio.
82 CJ-8 04 Light Khaki, rebuilt 4.0L w/FI on the stand and ready to go in.

info@inmotionusa.com ask for Jason and tell him Manny sent you ,This is really the best chip for the CDR..any questions PM me.
Manny

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Got Diesel