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135 n55 6mt (Jb4,dp,exhaust) Vs 135 n54 auto (jb4, dp, exhaust) From a 40 roll is basically even I have done it over 40 times. * Both map 2*
On our mustang dyno the difference is only about 10-20 hp+ for the n54 but the n55 torque reads about 10-15 higher.
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