ICON dual rate 4in coils???

G'day I've had a look around and haven't found much information on these coil I am looking at
upgrading to.
I am running AEV 3.5in coils at the moment and want to upgrade to a 4in coils that wont sag like my AEV coils
have and would like to know peoples thoughts on this brand and what experiences people have had with these ICON coils
any information would be greatly appreciated.

Thanks Jarrod
 
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