I know for a Antisurge need to have the slots lower slightly below the start of the fins. But what I actually Hope for is a bit better airflow by getting a slight velocity stack inlet and allowing to have a constant inlet size. Plus maybe it will make some cool noises like a whistle! Not to mention much bigger and cooler looking!

A really small turbo needs all the help it can get! The slits probably reduce flow actually but o well maybe the other modifications can overcome that.

89 Monturbo (RIP now but the heart is in the 90!)
90 Montero with 2.6 turbo swap! (close to finished)
88 Starion MPI T3/T4 Magna M8 head.....
96 Volvo 850