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Message: <blockquote data-quote="mcglsr2" data-source="post: 1391247" data-attributes="member: 15705">Two thoughts here:1) I'm not sure what you describe would work, as I imagine the shift light would need the ground connection to function - in other words, you couldn't hook the ground up to a relay, it would need to hook up to ground.  Now, if the shift light offers a signal out wire or something like that, then yes, using the light to trigger a relay to cut ignition might be do-able.  It would depend on how you wired the relay.  And I don't see why this wouldn't work on a V6 engine - or any engine for that matter, as long as you tap into the correct wire for ignition signal.Which brings me to 2) spark cut is typically worse than fuel cut.  If you have a choice between the two, fuel cut is generally superior.  No, it doesn't make your car run super lean.  It makes your car not run at all.  Which is kind of the point.  Spark cut results in tons of un-burned fuel dumped, which, as you said, can cause pops and whatnot in your exhaust (which is in fact exploding fuel - a good way to damage your pipes) and will pretty much demolish your cats if you still run them.OEMs chose fuel cut over spark cut for a good reason.  But to summarize, what you asked can be done given what I said in item number 1.</blockquote>