Low end power is a wide argument.. I make 400 ft/lbs of torque, which is stump pulling power. Its more a question of how usable the available power is.
Chances are if its a stock turbo and its not spooling then the twin scroll is not working or the turbo itself is malfunctioning. A 2.5 inch system wont choke a stock turbo, nor will it choke a big single, since I am still on a 2.5 inch catback.
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