I agree that removal of the heat stove, and air flap are detrimental to emissions. After all, the purpose of them is to reduce hydro carbons by way of rasing the interal combustion temp. So, since it is part of the emissions control system, you should technicly leave it in place. None of the Identification Labels on the car list the Heat Stove, nor the Air Intake Flap. However, the Engine Info label does state that the vehicle does conform to 1981 (or your mfg year) emissions standards by the EPA. So, if the regulations by the EPA do infact list this as a required item, then you are not able to remove it. BUT, things don't end here. Just because your vehicle is exempt from emissions tesing, doen't mean that you've got a green light to remove these items. It just simply means that there is no clean air problems in your area, so testing is not nessisary. So if some vehicles are not running up to a par emisssions wise, that's fine. It does not mean that you are free to override/modify/shut off/remove the emissions controls as you see fit. It simply indicates that you have alot more leeway with the efficiency of the emissions controls. This is why thins that modify the exhaust system such as bypass valves are listed as for off-road use only. And lastly, if you are considering an Island Turbo Kit, you probably can't run it legally where you live. You do of course need to check with local regulations. You'll need to verify the differance between is the vehicle simply exempt from emissions testing, or is it exempt from federal EPA standards? I believe that someone previously pointed out that once a vehicle hits 25, it is no longer mandated by EPA standards. But this depends on your areas local regulations (i.e. C.A.R.B.). So technicly, removal of a Heat Stove is no differant than remove of a Catalytic Converter. It's possible you might be able to install a modern more efficient emissions equipment. Something that could benefit both emissions, and performance. But you'll need to check with local regulations on that. Here in Nevada, if you have a classic car, you are restriced to originality, and milage. Rather than a smog test, the resigstration must include a signed affadavit by a car appraiser for correct milage, and orginality! So for me, that's more of a hastle than a smog check! -Robert vin 6585 "X"