Don't worry about it just by not buying/fitting one.
As far as I know there is nothing measuring the air flow after the DV. It joins in with the current airflow from the intake and adds to the turbo so its a bonus really having it as well as the intake airflow no?
In a nutshell that air is un metered air. The cars already seen it and its pushing the air up the re-circ back to the turbo.
The re-circ is supposed to keep the turbo spooled between gear changes etc, You may cause a little richness but hardly anything from putting one in, if anything a little more lag.
Honestly, I love forge, but it's poop. I GAVE mine away I thought it was that bad.
Revo did release an A4 sheet explaining about this Forge Spacer.
I seem to remember someone saying it was like cutting a slit in your boost pipe.
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