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To those that went from IS38 to bigger

Daks

Autocross Champion
Location
Toronto
Car(s)
GTI PP
Gap the RS7's to 0.024 as well?
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
Primarily to leverage the FCP warranty. Either plug has plenty of evidence of being a fine choice when properly gapped and changed at 10-15k.

Six of one, half a dozen of the other…
Doesn't FCP have the Ruthenium?
 

Escape Hatch

Autocross Champion
Location
USA
Car(s)
Mk7 GTI
I never recommend the XL unless there’s plans in place for MPI/LPFP/PM4.

The standard Vortex is the HPFP weapon of choice, but I’d love to compare your XL/HPFP logs to one to see just how much differently they spool. I’m guessing it’s not all that drastic
Happy to share, DM me your email address.
 

Daks

Autocross Champion
Location
Toronto
Car(s)
GTI PP
Dude I almost had you
 

scrllock

Go Kart Champion
Location
MI
RS7 or IHK24s @ .024". Just switched to the IHK27s due to shortages on the R7437-9s. But 1-step colder is fine for a tuned is38.
 
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