1) What are the stock plugs in an 03?

2) What plugs do you use for a 4# lower/chip/filter setup?

Thx

 

1. motorcraft platinums.

2. it-22 denso

 

I second that!

 

I'll third it.

 

i went with NGK tr6's in mine for a chip and pulley.

 

4th it.

Gapped at .041.

 

are these plugs colder or hotter than stock? if so, what is the reasoning?

 

There are pleny who are running TR6 s with no problem and thats what you should do at 1/4 the price litteraly.Im not a big fan of NGKs either but as often as we gotta change them.You should just go with TR6.Ive hear no complaints about them.

 

I 5th it

The fact is,
Nothing will get the heat out better than Denso Iridium.
Read this
http://www.denso.co.jp/PLUG/iridium-e/q02.html

Another fact is, Nothing idles better

Another fact is, NO MISSES AT ALL



Yes many use TR-6's and Love them
Yes BR-7's are as cold as Denso IT-22's,
BUT THEY WILL LOAD UP ON THE STREET, Denso's NEVER WILL

I love my Denso's, I run them with 4lbs of boost, 6lbs of boost,
winter, spring, summer and fall, with and without juice using both 4 or 6 lbs of pulley, and never skip a beat or have a problem.
Yes they're expensive, and yes they suck to gap, and yes they're fragile, BUT once gapped and installed, IT'S ALL GOOD