I had to smile.
Having driven a 2009 Gallardo LP-560-2 (yes it was monster fun - during spirited driving... heck, even around town) I see that $2500 would get me 15 extra HP and 8 extra torque. Really?
Having done the header/hp research like many others on this board...
A set of headers from ///M3AN ONE would be $320 shipped conus including paypal for Stainless and $530 shipped for
Black ceramic coated. Any decent exhaust fab shop can relocate the secondary sensors for another couple hundred at the most.
Alternatively, you can apply the sensor relocation costs to partly cover a tune that ignores the secondary sensors and jazzes it up a bit overall.
I would suggest that would be the best bang for your buck with change left over for trans mounts, a clutch stop, CDV delete, and a fluids upgrade.
Just sayin'
Cheers.