I am going to be installing bassani cat back (no headers) and the jlp forced induction cai. I am going to replace my plugs as well because I am paranoid the will launch soon(02 with 13,000 miles). What are the best plugs with these mods that will last a while? thanks for all the help brad.

 

NGK-TR6's gapped at .033 to .035 will be fine.
Marc

 

Brad, Over the last couple of weeks I have contacted a few tuners in regard to what spark plug to go with. MANY L owners say Denso or NGK. These two brands are what most L owners use. Anyway, I read over and over that the Densos do not hold up as well in comparison to the NGK. Another problem is the Denso brand can be a real pain to gap and alot of guys screw the gap up or break the tip in the gaping process. The NGK brand on the other hand is easy to gap. Another point is the Denso can run $9.00+ each and not readily available like the NGK where you can get the NGK most anywhere and pay under $2.00 each for them. Regardless which brand plug you go with you will find that plug replacement on an L is a real chore / a real pain in the ***.
I'd say do the plug replacement yourself and allow yourself 5 hrs time to do it yourself the first time and be sure you have the right tools. Oh, another bigge is whether to use anti-seize on the plug thread. I was taught you always use anti-sieze when plugs go into an aluminum head BUT most if not all Lightning tuners and apparently even Ford says use NO anti-sieze..
Will close by saying I went with NGK, no anti-sieze and I did the plug install myself. I went with NGK BR7EF Plugs with .036 gap as most of the L tunersI contacted said this 2 range colder then stock plug could be used with my stock L AND would be a good plug choice when I have a 4# lower pulley on which I plan on doing in the near future.. So, Brad, your choice... oh, I have Bassani cat-back and forced air.

 

My NGK BR7EF's have been in now for 30,000 miles(I think--my log book is elsewhere) but you don't need 7's. They are way too 'cold' for stock boost. TR6's are a little too cold but should be fine. There is no reason to decrease the OEM gap with stock boost. Keep the gap as wide as possible and still get reliable firing.

Dan