According to my VIN #, my 228i M Sport is equipped with the N26 engine, where the car is usually listed as having the N20. They are obviously very similar, but not completely; the N20 puts out more power over 5500 RPM. I ran into this issue while contemplating a Stage 1 tune and was somewhat taken by surprise at having a slightly less potent engine. Here's how the differential is described on Dinan's 228i product page:
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NOTE: In stock trim, we found that the N20 engine produces more power than the N26 engine at peak rpm (+24 Hp at 6,000 rpm). This, despite BMW’s claims that the N26 engine produces just as much power as the N20. Below 5,500 rpm, both engines perform identically. By all means, the engines are identical, except for the EVAP system and the catalytic converters. The N26 engine uses higher density (read: more restrictive) CATs, which robs power from the engine at high rpm. The N26 CATs have 900/600 cells/sqin, while the N20 CATs have 600/400 cells/sqin. This difference also affects the power gains with DINANTRONICS™.
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Can anyone comment? I'd be grateful to learn more. Thank you.