On average, how much do GFX cut down on road clearance?

[Cerwin Vega Fan]

Just curious cause the area I live in has tall speed bumps and I really don't want to pull the front clip off going over one. I know GFX cut down on clearance but I'm curious as to how much is lost due to installing GFX. I know the number will vary with each kit, I'm just trying to get a general idea.

Thanks

[Christopherrr]

with all things considered...an inch or so...base birds and formulas don't have extentions like TA's...but I know theres an inch or so of extention with skirts. Aftermarket stuff (I highly don't recommend aftermarket stuff...yuck) but the extentions should be even lower.

Keep it clean...please!