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I got the ess tune and catless downpipes on my x6 active hybrid and it completely changed the vehicle. Tons more power, its really a night and day difference. I still have super sprint front pipes and x pipe but I don't think they really did anything except alter the sound of the exhaust slightly making it sort of high pitched.
I noticed that a lot when I had the stock downpipes and the meisterschaft exhaust and I had added the super sprint parts. since then I have gotten rid of the meisterschaft because with the catless downpipes it was just too loud for me. I put the stock muffler back on and used steel zip ties to keep the exhaust valves open. Now it sounds nice and throaty with a good burble at idle.
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