On most cars when raising the boost, you want to go to a cooler plug. On these, based on my searching the OEM plugs are:
- Platinum Spark Plug Part #FR6KPP332S
- No gap listed on Bosch website
- Laser Platinum Part #PFR7S8EG
- Gap: .032
I was thinking of actually switching to a NGK BKR7EIX (iridium plug) or just run what I run on my other turbo cars the NGK BKR7E (copper plug). It's a heat range colder than the OEM Bosch and only about $2 at any auto parts store.
Bosch Heat Ranges (7 is hotter, 5 is colder)
NGK Heat Ranges (7 is colder, 5 is hotter)
They are reversed. So really going to a NGK BKR7 vs. a Bosch BR6 means that I would be going one step colder.
FWIW, I've seen Arin from APR say they send out NKG PFR7Q and PFR7B plugs gapped to .028 with their stage 3 kits.
What do you think?