Spakk plugs
 

I'm concidering NGK TR55VX plugs to replace the stock ones. Are they any good ? I've been told good things about them. How often do they need to be changed?

Dan

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'96 Cobra, Steeda G-Trac
Stage III Suspension, K&N
Filter,77mmPro-M,FMS Ceramic
Coated Headers,Bassini-X Pipe,
FMS Al D/S, FMS 3.73's, Cobra R's ,
Firestone SZ-50 275-40x17's,
Powerslot Rotors, Preformance Friction Z rated pads,
(Track PF90 Compound pads),Steeda Tri-Ax,
Schroth Restraints,Kuhmo Victoracers(for the track)
Steeda Functional Wing.
1:32min @ Summit Point