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That sounds pretty good. I'm going to do that to some day. It's a pretty good mod to get started with. Even the M3 came with the smaller throttle body. Which is stupid in my opinion. Where did you get that manifold for 90 Pounds? is that in england?

That would probably be an amazing system. But I personally wouldn't do that to my BMW because I don't have the time for that. But if you want to you could probably do it by playing around for awhile and fabricating something. It would be a cool system to have.

I think the smaller would be better for the daily drive as the torque is higher in the rev area where you drive usually. what do you mean exactly to switch between the two? If you want to change one it takes (I would assume) at least an hour to change. I could be wrong. it might take even longer.

BMW put a smaller throttle body into the 328 to get more torque in the mid-range of the revs with a little sacrifice of top end horsepower.