without trying to sound like i am contradicting anyone ill say what i know and leave it at that

Standard and turbo plugs make exactly the same seal.

Turbo plug advantage is a smoother flash front as opposed to standard plug which can protrude into the geo dome, Turbo also have a lower geometric compression which aids top end, at the loss of a little torque.

thats why Turbo were more popular in on road racing

when they first came out i heard all sorts of stuff

Turbos make more power
Turbos are more delicate and cant be used off road
Turbos need 8 % oil to work
Turbos require softer clutch shoes
Turbos have nicer personalities
Turbos requre more after run
Turbos run hotter
Turbos run cooler

lol

M