Does anyone know the size difference in inches of the sti hood scoops ( the ones all the vendors sell for $175 painted) compared to our original wrx ones? Debating on buying one and have heard there is only a half inch difference in height all the way up to one and a half inches. Anyone got the definitive answer to help sway my opinion on buying one? Thanks. Mike

It's definitely bigger and will suck more air in. I haven't measured it, but I'd say it's more than 1/2" and less than 1-1/2" :p It's noticeable though, especially when you're near a stock WRX. Also, if you autocross, it knocks you all the way to Street Modified...

I just got a STi scoop recently and holding it up to the stock it's looks to be twice the height of the original. Hope that helps.

What do you hope to gain from the new scoop? Has anyone dyno tested to see if improvement yields anything? Seems to make sense as an easy mod.

Thanks

Thanks for the info guys--ordered one yesterday from the good people at j-spec tuning, can't wait to install it.

Mike:)

1. What is the effect of the forward motion of the car when using the hood scoop?

2. Does it matter since it's not an engine intake, it just needs to cool the intercooler?

3. Would this effect measured on a dyno since the car is not moving?

Originally posted by MonkeyAB
1. What is the effect of the forward motion of the car when using the hood scoop?

To force air through the Intercooler. This cools the air that has gone through the hot turbocharger (compressor Side) and increases the air density. The more dense the air, the higher o2 content, the better the burning environment in the cylinder.

2. Does it matter since it's not an engine intake, it just needs to cool the intercooler?

Yes, for the reasons mentioned on question 1. Dense Air makes more horsepower.

3. Would this effect measured on a dyno since the car is not moving?

Only if a fan is placed in the path of the hood scoop simulating the actual road speed. This is a good point, if you dont blow air through the Intercooler while tuning on a dyne, you are probably not getting an accurate result.

Great questions.

Keith:)