Big speed drop

Red Larsen /
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My 2001 TTLX dropped from a top speed of 43 to 30-35. The acceleration has also decreased. The carb has been cleaned, the exhaust port isnt clogged with carbon, and the biturbo is only about a month old so i think its ok. It had a fuel leak due to a crack in a fuel filter in the gas line. After replacing that it still made no difference. What could it be?

-Red

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