Hmm.. good to know. I wonder if they were using stock plugs or not. if you could point me to any other feedback/experience that would be a huge help. Also, if anyone here has a '19 Elantra has a race chip or similar module, I'd definitely like to hear your experiences.... unless I'm the firstI see you have a '19+. Fair warning people were having issues on the '19's with the AFE Scorcher (same type of device pretty much). May have abandoned it due to misfires and the car going into limp mode.