I ended up getting BCPR6ES plugs .... i could not get BKR7E, only BKR6E was in stock....but aparently they are different, the thread lengths are different. NGK recomends a replacement plug for the PFR5G-11, BCPR5ES. so instead i got the "6" heat range (BCPR6ES) gapped 0.8. i will give these ones a go anyway. if they fail still, i will try something else, but as i'm reading through all these suggestions in the tread, it seems anything is worth a shot, cause everyone is saying different things