I'm currently in the market to purchase and equal length header for my 2011 WRX (perrin vs invidia) and had a couple questions:
1. I read on Cygnus Performance website that the Perrin equal length header on 06+ WRX's required modification of the oil cooler. I have not read this anywhere else (manufacture's website or other review forums). Has anyone else heard of this? or anyone who installed perrin headers had to do this?
2. The Perrin header allows you to retain the stock splash guard with out any modifications. Do you know if the Invidia does as well?