for a disco 2 manual (yes i know its not a p38)
4.6l top hatted short $5.5k plus labour $2k. total $7.5k (from TRS)
ls1 + bits $6.5k plus labour $3.5k. total $10k (from my mechanic)
yes the ls1 costs 33% more but your getting something for that money
4.6 is 168kw and 380Nm
ls1 is 235kw and 465Nm (untuned)
which is 40% more peak power, 22% more peak torque.
if you look at the power band for both engine, the ls1 produces more torque down low too.
fuel economy in the ls1 is also better.

