I got to test out my new TR6 today and first thing I noticed my start up afr numbers were higher ,learner, than before and my cruising afr numbers were higher, learner, at cruising so that means it is getting more spark to them spark plugs that before to make them more efficient . I did not touch nothing else on the engine for as any tuning . Plus it helped my take off as now it will spin the tires more easily than before so it really helped my 87 TB box stock with a few minor bolt ons to higher levels of power , Taking that 27 year old coil and igniter off and replacing it with modern technology is a plus for sure . This is my 2 cents and 1 of the best bolt ons for the money that works . Bob you the man keep up the great work .