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That hill climb 130 definitely has either the S50, S52 or S54 engine.
I doubt that N52 can be modified, even with ITBs to delivery more than 310-ish tops. Maybe the internals and head are from the S engines? But would be much easier to swap the engine and meet the class specs.
Which is also why you do not see much E82s in racing, class specifications wise it is too heavy (here in Germany) and without any engine mods the 125i/128i is seriously down on power when compared to the competition. Once you enter a higher NA class, the M3s comes into play. Remember how the E46 M3 had at the time the high hp per liter engine.
Anyways, that is the reason why i just do not want to switch to turbo engines, despite their silly efficiency and on the road performance, bouncing rpms at 4K+ and always making power till redline just works so well on the track.
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