I had these in a porsche a few years back and they burned great. Nice design no hype...I am going to try to find them for my S, Well respected in the porsche community.

 

I'm running the standard heat range Beru Ultra-X in my Cooper (non-S). I can honestly say I can't tell a difference from the stock NGK plugs. The price was right from outmotoring.com, so I thought I'd give them a try. Idle seems the same. Acceleration is just as rockin' as it was before. I'm currently running them with the Performance Distibutors Screamin' Demon Coil (modified by Pilo) & Kingsbourne 9mm wires.

 

I have them in my 04 MCS w/ 15% pulley. Can't really feel any difference than with the IK22's. Got them at Outmotoring.
http://outmotoring.com/beru_spark_plugs.html


Jim

 

I have 'em as well, no difference felt at the ol' butt dyno, but I will keep track of how they hold up. Mods are 15%, JCW intake, Milltek exhaust, Pilo/PD coil, Kingsbourne wire set. Soon to have 380cc injectors and a yet-to-be-determined ECU program.