Does anyone know the part numbers for the ngk plugs that are 1 heat range colder than stock, and 2 heat ranges colder.

thanks in advance.

For coppers, they are BKR7E

is that one heat range colder?

Spark plugs aren't difficult to read. If the stock P/N has a "6" where Terrin's P/N has a "7," than a 7 is one colder. 8 would be two colder. Check it out:Ignition / Spark Plugs - SE-R.net (http://www.se-r.net/engine/ignition.html)