Sounds like a leaf blower when I start the car...

[ewillis]

Assuming it's the air for the suspension. Is there any harm in NOT addressing it until I swap the suspension for springs?

 

[subspd]

Sounds like the air injection pump is failing. There are companies that make bypass kits.

 

[intoodeep1113]

Is it coming from the engine?

Hewitt-Tech Gen 1: Secondary Air Injection System Bypass Kit (Plug & Play)

Gen 1 (V36H) SAIS Bypass Kit is compatible with most 2005 - 2007 Toyota / Lexus Trucks & SUVs. It enables you to clear the Check Engine Light, Limp Mode and error codes related to mechanical SAIS faults. P1441 P1442 P1444 P1445 P2440 P2441 P2442 P2443 P2445 P2447

hewitt-tech.com

 

[ewillis]

Is it coming from the engine?

Hewitt-Tech Gen 1: Secondary Air Injection System Bypass Kit (Plug & Play)

Gen 1 (V36H) SAIS Bypass Kit is compatible with most 2005 - 2007 Toyota / Lexus Trucks & SUVs. It enables you to clear the Check Engine Light, Limp Mode and error codes related to mechanical SAIS faults. P1441 P1442 P1444 P1445 P2440 P2441 P2442 P2443 P2445 P2447

hewitt-tech.com

Yeah...sounds like it must be the injection pump. I'll get the bypass and then dump some $$ into a spring conversion.