Spark plug help for a gen3
About to do a service on my Mr2 spyder and will be changing the spark plugs.
Anyway the issue is which to use. Toyota and auto barn both say to use BKR5EIX-11, but the motor has BKR6EIX-11 in it, the previous owner must of had those installed even thou it was 100% stock when I purchased it.
The only motor mods ive done since owning it is a custom intake (uses a k&n Apollo air filter) which draws air from the left scoop, a full exhaust (4-1 headers, hf cat and custom made cat back with 2.25 inch piping) and stage 1 cams
(8 degree increased duration on both intake and exhaust cams and a 0.020" lift increase on exhaust cam only) plus a piggy back tuned to run it all with increased timing on 98 octane, it also has a thermostatic oil cooler. This has given the motor roughly a 20% boost in Kw at the crank (stock 103Kw now 119-121Kw).
So should I just go replace them with the stock 5 heatrange ones or replace them with the cooler 6 heatrange like it has?
Thanks for any help