[felix_browne]

definately check for exhaust leaks before remapping fuel. finding a crack or weak spot in your exhaust (while it is no fun) is certianly better than concealing the problem by leaning the mix. plus in a turbo car you would then have to worry about preignition (which would be much worse than the occasional pop). sorry if i am stating the obvious but as a person who grew up with rx7's though, backfiring on engine breaking is something that i have become familiar with.