Paul is sound and will deffo do a good job.
It can be a bad thing and lead to alot of money spent if you case power figures dude, although i do no know where your coming from and that the drop is unexpected.
Manifold is a must, glad your getting one
, but i would hope that you get 230hp at least with an intake / manifold / exhaust / ecu.
If the original issue remains of why the power dropped then you will not get this. Hopefully is its underlying it gets picked up otherwise you wont really know if a manifold & remap is done again.
All the best.