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Hello guys. I got an evo 9. I got stm upper i/c pipe kit short route. I bought tial qrj bov with v band in i/c side and tube output on the intake side. When i run the car arround 120-130km/h if i leave softly my foot from pedal it starts fluttering and the car starts surging. Any ideas what is wrong? maybe the spring?
That’s what happens when you ditch the dual port bov with single port bov. You can try a softer spring, but it is somewhat the nature of doing that swap.
