Hi guys are grade 8 plugs too cold for a lightly tuned z32 exhaust filter uprated side mounts 1 bar boost seen some Hks ones on eBay that all thanks Taff

I can only say that I have them and have not been a problem but I have done practically everything under the bonnet possible to enable 500hp whilst keeping stock internals mind, so a little more tuned than you state, always suck them and see :thumbup1:.

Edited December 19, 201312 yr by phutumsch

Stick with 7s mate they will be perfect. I was told if you run a plug that's to cold it can cause starting problems

I run 8's, only time they been a problem was with a too rich tune so fouled with cold starts. No problems with a good tune. Coppers seem more resilient to fouling too

Too cooler plug will cause fuel fouling potentially, this can lead to excessive carbon deposits miss fires and preingniton. Basically if the combustion cycle is inadequate you could end up frying the pistons.