Re:what's
Dont think there is much doubt that Denso plugs are the best.
HKS plugs are made by Denso , infact, id say the iridium tipped Denso's
are identical to the HKS plugs apart from packaging.
Stock grade is 7, but you should consider using one grade colder, ie grade 8;
if your running extremeley high boost (1.5|PLS|) perhaps even the coldest , grade 9.
The HKS plugs are graded in 5's, so a grade 7 is S35 , grade 8 is S40 and grade 9 is S45.
Anyway, my advice is to buy the S40's ; I have them in mine and they work fantastically.
There is one VERY important thing to remember, you need type G for an Evo.
SO, S40G is your plug !!! Gap them to 0.8-0.85 , being iridium tipped you must be
ultra careful gapping them.
These plugs should last 30,000 miles , I tend to change mine every 15,000.
Now for the bad part, retail is £14.50|PLS|vat|PLS|delivery per plug.
I always keep loads, so if you get stuck and cant find a local dealer, ill send
some accross with the usual MLR discount.
I think retail on the Denso plugs is £14.50 inc vat.
Justin