Quote:
Originally Posted by CSG Mike
The Ace only needs about 5mm clearancing on the stock undertray. Basically you are taking the ridges and flattening it.
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To piggy back this, after hammering my undertray so that the header didn't rub, there was no height change of my undertray. Everything is still in the OEM location and height. There's now just that super tiny bit of clearance needed for the header to not rub.