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Discussion Starter · #1 ·
Hi there

I cored the pipes on my 05 620 this weekend and it now sounds like a propper duke. While i was in the process of doing the mod it dawned upon me that i would be lowering the back pressure in my effort to create some decent sound. My question to you guys is whether some kind of change needs to be made to the fuel mixture to counter the change and if so how do i go about doing this?

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