are you sure that the chain needs to be replaced? How many miles has your car done? a chain is used so that you do not need to maintain a more traditional belt. If you have a problem with the running of the engine, it could be the timing that needs to be fixed and not the chain, take it to your nearest nissan dealership and ask them what the problem is, and if they tell you the chain needs replacing, tell them what I said above, that you thought the chain didnt need to be replaced.
Skotten, August 2007