So im sure everyone on here knows how ive been contemplating putting on a 540 throttle body to pull more air in. Well upon further research i came across this:

08/1994
540ia
Intake Mani: 11611729528
ASC TB: 13541747763
Standard TB: 13541741671

530ia
Intake Mani: 11611729692
ASC TB: 13541747768
Standard TB: 13631726591

All the part numbers (from realoem) do not match up... Does this mean that the 540i intake manifold was designed differently? Larger bore runners perhaps? I dunno, things are getting complicated. A larger TB sure, but a larger intake mani can cause the engine to run entirely different.

Im thinking that if i did swap the entire intake/mani/TB off of a 540 i would end up losing low-end power, possibly gaining more top end, higher RPM power, which is not what i want.

I want more torque for the street, not hp for the autobahn... So what are the Pro's opinions on this?

Well the 45 degree ASC TB is out of the question. Just took an asc101 class, and asc TB on a non asc car will not work.

Now, onto researching more about the standard 4.0 TB...