NGK TR6 or TR6ix?

[00stang37]

I'm in the process of installing a P1SC on my 2000 GT and was planning on ordering the TR6's when I came across the TR6ix's. I've heard that platinum and iridium are bad for boosted applications compared to copper but from searching, there's quite a few Cobras running the tr6ix with better drivability down low. Also not having to change the copper plugs often would be a plus.

Tr6 - $24 shipped
TR6ix - $55 shipped
I don't mind spending the extra $30 if they will work as good or better especially if they have a longer lifespan. If there's more probable issues with the iridium' then I'll just stick with the coppers

The car will be on 10# of boost and right 375-400rwhp hopefully. I'm not looking for anymore power on the stock block

Thanks for any input

 

[Drive XR7]

I got a smoother idle with the TR6ix's.

 

[01yellercobra]

Iridium is fine for boost. But don't run platinum. I've never run the iridium plugs. I've never had an issue with the TR6's so I didn't see a need to.

 

[00stang37]

What's the typical replacement interval on the coppers. I've been seeing 3,000-10,000 miles.

 

[01yellercobra]

I never went more then 10k on mine.

 

[00stang37]

I think I'll grave the TR6ix. Advance auto has them in stock for $7 each

 

[Brutal Metal]

just get regular TR-6's

 

[00stang37]

just get regular TR-6's

The plan was to get the tr6's but the ix's seem to have better idle results

 

[SSThunder]

What about for a 2008 Shelby GT500 with 2.6 upper and 10% overdrive pulley? She maxes out the stock boost gauge(15). Other mods are Kooks LT headers with cats, x-pipe, CAI and McLeod twin disc 1000 hp clutch. Car has 42K miles know. I've put 11K on her since I got her in April 2014.

 

[00stang37]

Got the TR6ix for $45 at advanced auto after a 20% online order discount