While these may look like "snake-oil" plugs (like the SplitFire and
others)...I can tell you that these work EXCELLENT!
I went on a recommendation from another shop owner who's been running
the 5224 and 3923 plugs in his Dakota and had recently switched over to
the HALO plugs.
There are NO FTC complaints and plenty of data to back up their claims
(both in the US, EPA testing, and Europe). After the initial install,
took the truck for a drive and throttle response is much better than
with the other plugs (including the old set of Iridium's that I used as
a test).
I'm running the H-9B's (3923 equivalent) and they work very well. I've
only got about 50 miles on them right now and there's no problems with
boost or nitrous with these plugs.
Bernd D. Ratsch
1997 Dodge Dakota SLT - V6/5spd CC
Carillo, KeithBlack, Crane, Mopar, CompCams,
NOS, Ractive, APS, APEXi SAFC-II Controller, ASP Pullies, JBA,
Magnaflow, CarSound
Current Best: 14.91 @ 94mph
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