MY03 STI UK PPP

Do I just use standard plugs or do I use one or two grades colder ?

 

You won't go wrong with NGK PFRB-7's mate

 

Yep, second that. But beware that some Subaru servcing/dealers won't fit them as I found out after buying some to be fitted. In the end they fitted pfrb-6's as the pfrb-7s were not approved items :-( If doing it yourself then go for it. Currentl;y run the pfrb-7s in my Daihatsu YRV Turbo and they are very good :-)

 

PFR7B all the way

 

6's are good enough for the PPP'd cars, even the wr1 runs 6's
Only the JDM twin scroll STI runs 7's as standard.

Tony

 

Whats the benefit of 7 over 6 they is only a small difference in the price .

 

7 is a cooler plug, for mildly modified engines.

 

What sort of power would you start to use the 7's over 6's? For about 330bhp should you use 7?

 

I had 6's in my 2002 UK STi and at 335hp, they started to fail. Put 7's in and job sorted.

 

Should have added, you can put PFR7B plugs in a standard car so just stick em in, they worked fine for me right up to 430hp.

 

Where is the best place to get a set of the PFR7B's?

 

I got mine off eBay. Arrive fine.