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So, I want something to make my 98 Subaru turbo make this sort of sound

https://www.youtube.com/watch?v=QBUIsYa_E5M <--- More like this one. Is that just with a Forge Valve and filter?

OR do you have any videos of yours that sound better?

I've just got a Cosworth Panel Filter and Scorpion centre and Backbox. Would I need to get it mapped when I put the Forge Valve (or any valve on)?

Does it badly affect petrol usage?


Any negative affects on the engine or turbo? (read up and found quite a bit of scaremongering... )

Thanks in Advance,

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