What's the latest consensus on aftermarket spark plugs?

[WA 2 FST]

On my '99 I only had the plugs changed when they did the I/C recall...and I didn't swap them out. Just went back with the stock Motorcraft ones. After all, I only had a chip and 2lb pulley on it.

2-3 years ago, everyone was suggesting NGK TR6 plugs. Now I read about Denso plugs.

If I were to upgrade to an Apten blower and 4lb pulley, what plugs would be best? How often would I have to change them? I assume the non-platinum plugs, if used on these motors, require a significant step up in the change interval.

thanks

[tliss]

I've got Denso IT-20s about 16K miles ago. Just got the Apten ported blower about 3K ago. No isses on the street or track, and I would assume the plug change interval would be the same as stated in the manual....every 100K or something?

I'm interested in what others have to say....

Tom

[L8 APEX]

I have used Tr6's for a while now. Densos are nice but they are pricey. I would change them at 20-30K no matter what plug they are if I drove it hard.

[Crawford]

I ran the Denso IT24s with my #6. I new run the NGK TR6 with my #4. I love the TR6s they are cheap and they are a tough plug. I have had mine in for about 30k and have not had any problems. I cant tell the difference between the Densos and the NGKs.

[WA 2 FST]

Cool, I've got some extra TR6's sitting here on my workbench.

[Mark #2]

Cool, I've got some extra TR6's sitting here on my workbench.
I'm running the new TR6ixs, even better than the TR6.

[Crawford]

I'm running the new TR6ixs, even better than the TR6.
Whats the difference between the old ones and these TR6ixs? How much do they cost? Details man! Details!!

[DamonH]

Whats the difference between the old ones and these TR6ixs? How much do they cost? Details man! Details!!

The IX's have iridium tips ... probably $80 or so as opposed to the $16 non-iridium. Supposedly they just have a little better idle from what I've read. :cool:

[Mark #2]

Whats the difference between the old ones and these TR6ixs? How much do they cost? Details man! Details!!http://www.ngksparkplugs.com/products/cars_trucks_suvs/iridiumix.asp?nav=11420&country=US

About $5 a plug.