It wasn't anything scientific just the Buttomatic Dyno. I replaced my spark plugs the other day and thought I would throw the stockers back on to see if there was any difference. I expected the engine to run a little smoother just because of the new plugs, but it didn't. In fact it ran worse. It was real sluggish and the throttle response wasn't as crisp as it was before. I drove it for a couple days like that and it was more of the same. Then today I removed the stockers and threw the GMS's back on there and boy what a difference. The crisp throttle response was back and she ran nice and smooth like she did before. And no, before anyone asks, the stock COP's weren't bad. I'm not advertising for GMS or anything, I just thought I would share my experience.

 

Hey SWThomas, how about a link, on the specifications, or part number and cost?
Was it a strait bolt on, no cutting or modifications needed?
Thanks!

 

This is where I got mine...

http://www.lightningforceperformance...-2v-p-305.html

I did have to cut them a little but to make them fit, but I believe they have that issue worked out and you're suppose to tell them what plugs you're running when you order them. That way they can send you a set that are already cut to the proper length for your plugs.

 

If the stock COP's were running worse than the GMS something was hooked up wrong, I have had to buy about 4 sets of GMS's to get 8 good ones. In most cases they failed while still on the dyno.

 

You must have gotten some bad ones. Mine have been running great ever since I installed them. And yes, the engine does run better with the GMS's compared to the stockers.

 

Thanks for the info SWThomas. LPF is one of our local (Houston) vendors. I see he has a variation of COPS.. I will have to give him a call.