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I tried a modified tmic with 2.5 inch inlets and outlets but never did a stock. If someone is willing to pay shipping I can send it your way to see if it makes a difference.
Ahh well I'm running a stock s5 Turbo so I'd think 230hp @ wheels would be fair, it depends on how rich I'm running with this rtek 1.7 with 550/720 - walbro 255.