What's the best Spark Plugs to use for a Ford Falcon Forte AU Intech 4.0

i just changed myne recently with ngk iridiums from autobahn's bro
i also changed leads with top guns

Mate, there are going to be alot of conflicting opinions on this. There was a huge discussion recently on the topic. At the end of the day it should make very little difference. Just change them often, and make sure they are gapped right.

Well, if it's a:

Series 1/2 (98-00) use: NGK BRR5EY-11 or BPR5EIX-11 iridium type.
Series 1/2 (98-00 on gas) use: NGK BPR6EY (0.8mm gap) or BPR6EIX (0.8mm gap) iridium type.
Series 3 (01-02) use: NGK IGR5C13

Irridium tip plugs generally last 3-4 times longer than ordinary plugs but at nearly $25 a pop, they can be a bit expensive in one go. So really you're paying the same as what you would for ordinary plugs if you replaced them in the same time frame plus you get a 'slight' performance increase. Just be sure to give the irridium plugs a bit of a twist every oil change so they don't become 'one' with the head.

You shouldn't need to gap the plugs, the -11 in the NGK part number is refering to the gap size (-11 being 1.1mm, -15 being 1.5 so on and so forth). If there is no number at the end of the letter sequence it will be a 'standard' 0.8mm gap, best used with boosted and gas applications. BUT you can use these plugs if the store doesn't have the 1.1mm plugs, just get a set of feeler gauges and adjust the electrode on the plug untill it measures 1.1mm, simple.

google advanced search found this

what-jmm-plugs-look-like-from-the-inside-t73590.html

i use ngk plugs and topgun leads

mind you this cost around 180

But my advice is if you car is 100km+ do your coil pack as well another $100 but you will be able to tell the difference

Far out! Where do you get your parts from!? We have NGK plugs for $3.95ea and Topgun lead sets for $55. Coils alone are only fifty bucks.

If I get more expensive spark plugs (say.. Iridium ones)

Do I then need to change the spark plug leads as well?

No.

However if there cars done 100,000Ks on its original leads, replace them anyway.

Don't expect any gains from plugs in a stock car.
I run Autolite 985's atm, as i bought them cheap and they're recommended.
But when they're fooked, Im going back to me NGK ZGR6B-11 or BPR6EY-11

I just took off the spark plugs on my Ford Falcon AU Forte 4.0L i6 (Duel fuel - LPG/Petrol)

The spark plugs are: Bosch Super plus WR9LCX + Germany 790 +28

Are these any good for my car? or should I replace them with something like NGKs?