Loud acceleration noise with straining sound.

[noe]

Hello, I apologize if this issue has already been addressed.  I own a 2020 RX 450h F-sport and recently noticed a louder/higher pitched sound than usual when accelerating quickly up to ~40mph.  It's the type of sound you would expect to hear when you drive this thing up a hill at a faster speed.  From the stop position up to cruising if I press the gas slowly it does not create this sound, but any hard or quick push does until it come up to cruising speed.  I've previously owned multiple RXs, a RX 350 and RX350h and never had this issue.  This is my first F-sport...is this normal for this particular model?  In addition to this, does anyone know if the Toyota dealership will service a Lexus at a lower cost than what the Lexus dealership charges?

Thankyou in advance for your help!

[RX400h]

It looks like this sound was not present when you bought the vehicle? Is your RX still under warranty? If there is a Toyota-equivalent vehicle, then typically the service cost would be less expensive than at a Lexus dealership. I've had our spark plugs and coolant changed at our local Toyota dealership. Its reduction in cost for the maintenance tasks were significant.

[noe]

Thankyou Dave for your response.  I've had the vehicle nearly a year and don't recall hearing this straining sound.  I guess I'll just check with Toyota to see if they may be able diagnose the problem first. I bought it second hand which is why I'm trying to avoid the awesome Lexus fees if at all possible!