He-115 in 1/48 scale by Speciial Hobby is a great kit, but it has several mistakes and flaws. This upgrade kit by Leadwarrior addresses most of the issues of the engines and cowlings.

This photo of real He-115 and the Special Hobby model shows the overall mistakes in proportions of the cowling, propeller, and main pylon:

Leadwarrior set corrects proportions of the pylon:

and the cock with propeller:

The simplified representation of BMW-132K engine was replaced with detailed one, including exhauust system:

Some useful reference photos: