Wow! thanks jsears! I'll let him know.

You can buy another bimmer like a brand new 335 coupe for that.

I've done the Dinan Software upgrades with throttle body. The exhaust was too much for my liking so I went with deleting the resonators and replacing with an X pipe. Those mods alone gave my 3.0i a little more life in the mid and high range of its power band. No dyno slips but the car moves with less effort than before.

I have ordered TMS pullies and have yet to install them. I dont expect a huge increase in power, but enough to consider my purchase worth it.

Another suggestion would be to try the software upgrades from Superchips, TMS or Conforti...

TMS HP pulleys..... You will love it.

Have any of you 3.0i engine up graders ever ran a dyno for your X?

I would if I needed to know the exact numbers my X is putting out, but for the minimal amount of gains I already expect, I dont exactly see a point. At most, I'd be 10-14hp and 12-18ft.lbs more than stock. Even if it were slightly less, I wouldn't be disappointed. Its clear the 3.0i version of the e53 lacks power upgrades, aside from a supercharger kit.

Maybe if dyno runs were cheap/free and nearby I'd throw it on to see the numbers.

I hope so.....thank god they weren't too expensive either..:thumbup:

I also have the same question but on a 4.4. Would I see any "real" difference just upgrading the engine software and tranny software?

I am pretty sure upgrades on a 4.4 engine would be very worth it. And improvement felt would be much more obvious than on a 3.0