iridium spark plugs ,are available at a&h motorsport, in horsham, pa., right across the street from willow grove navel air station. their phone # is 215-657-0775. the plug the stock max uses is equivelent to a ngk 5, the one for s/c max is recommended equivelent to a ngk 6, that part # is ik20. 13.99 a piece, total with tax if u drive there is about 88.98 for 4-6 hp. and if u install them urself. also they can mail them from there too. which is faster than california. duh. by the way they said they manufacture hks iridium plugs. if u change ur own plugs be sure to blow out the sand and dirt around the plugs before you pull them. peace, out. yea i am 41 and talk like that too. and have 2 kids. have a nice day. and i mean that.

 

Are you from around the willow grove area?

 

i live in west chester , about 33 miles away. i used to go to willow grove for reserves, so i know that area a bit.

 

It may be the going rate but damn.....$14 a piece for plugs? Are they solid platinum or something? :-)

 

(and DON"T ask what the hell iridium is!)

 

but it is supposed to give measurable hp gains.4-6, some say 10. and for 85 bucks, thats a pretty nice tweek.

 

aw dope...right now on groupbuycenter.com theres a deal going down..but its for sets of 4.
Heat Ranges 16-24 (ngk 5-8) 13.95 each. Set of 4 =$55.80
Heat Ranges 27-34 (ngk 9-11) 19.95 each. Set of 4 =$79.80
..after what sleeper said, i think imma join

 

I thought the +4s where expensive They did offer me a nice boost in responsiveness, and about 1.5 measurable HP.
I'm upgrading the Max one item at a time about twice a month and measuring increases.

I would want to see 5-10HP boost on paper before buying these plugs. If it’s true, these are great, and the 2nd best mod for the max! 3rd if you count the SC.