I agree keep any emission part you take out just in case the laws where you are change or are enforced more greatly. every mechanic will do the inspection different and may miss or not check everything. some that are looking for ways to make the most $$ will check everything little they can fail you for. Also before going straight pipe check you states DVM web site for what the inspection requirements are. Mine are surprisingly strict considering that Diesels are exempt from emissions testing. I have to keep every emissions part mine came with, including the Cat, EGR, muffler and all. they won't check that it works but if its not there, looks tampered with or leaks I could be failed.

Here is Pennsylvania's inspection code for passenger cars and light trucks.
http://www.dmv.state.pa.us/pdotforms/pu ... tion_e.pdf

_________________
2006 Liberty CRD Limited Deep Beryl Green Metallic Clear coat, Fumoto valve, MH ProVent (removed), GDE Eco tune,
OME 790/948 springs, OME struts, OME N132L shocks, Jeepin by Al A-arms, Hercules Terra Trac AT2 245/75R16
Weeks Stage 1 EGR delete, 5 volt steel glow plugs

Just do the muffler (Magnaflow), anything else is a waste of money, and who wants a noisy and vibie KJ, not me.

_________________
O6 Limited CRD 4X4, Frankenlifted II, Magnaflow, EHM, ORM, 245/16 BFG, AllJ's Rear Rack, Lightforce Aux Lights, Tjm front bumper, Tmax winch, Scorpion diesel tuner and Baja Tested.