GM TDH 5303 - New Look Bus LC and NYC

I like a lot your bus ,nice job . I notice when i drive from interior loking in front the engine sound is very very low but if i turn my head back or side then engine sound is normal . How can i fix the front look sound to be higher ?

@RYANCQQPER Me again , i find out why the interior engine sound of your bus is so low in my case and is because of First person mod . When is deactivated all get back to normal .

What is model year of this bus?