Just want to get some thoughts on this.

I've got a Safari snorkel that uses a factory adapter to connect to the airbox. The internal diameter of this adapter is 2.5".

I want to reroute the piping from the snorkel into the airbox (to remove some of the bends) and I'm having to make up a new adapter from plumbing parts. The issue is that the new adapter will have an internal diameter of 1 3/4".

My question is will this have a major impact on the performance output of the engine as effectively I'm reducing the size of the air intake pipe into the airbox by 3/4"

Thoughts?