Quote:
Originally Posted by 631twentyeighteye
No. 125i is rated at about 200hp while the 128 is rated at 230hp, thats why the 125i gets bigger gains, because it has less power in the first place. You'll get both to about 260hp with a good tune(and the DISA manifold swap on the 128i).
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N51 has DISA, but I agree, 260hp shall be the limit without other mop.