No.
In most states yes, it is illegal :)
Well no if the modifications are illegal.
Yes, it is illegal to sell a vehicle, that came equipped with a catalitic converter, with the converter removed, in any state.
You must sell and advertise the vehicle "as is, where is" otherwise the sale is illegal.
Yes, but you must tell the potential buyer that it is missing. That it may be illegal to drive the vehicle without it.
no, the distance the vehicle has covered must not be changed as it will be incorrect if you ever sell the vehicle and is therefore misrepresentation and that's illegal.
NO! Not unless it is a vehicle that was produced before the introduction of the VIN system. That would be prior to 60s. Otherwise it is illegal to sell a vehicle with the VIN tag missing.
no it is not illegal to sell drinks out of your car
No, it is not illegal for a creditor to sell your debt.
No, it is not illegal to sell a house for cash.
Ummm.. i think by that sentence alone it pretty much answers itself.. Yes, if you have a case against this car, report it.. and if it ohkay after that.. Buy it! But im 99.99% positive it IS illegal.
No! It is not illegal if A Certified Garage will gives you the reason for the change like 'Motor changed' or if your original 'cluster' was not functional.It is illegal if you sell your vehicle under the misimpression that the vehicle had done less mileage because of the replaced head and the seller does not inform the buyer of this change. A better way to deal with this situation is to get a written and signed by the buyer statement before parting with the vehicle!!