First.
My previous professional tuner changed my B1901 max allowed engine torque from 650 to 866. Is this of any valve with a ~425 hp LS1 MN6?

Two,
In that an 02-03 Z06 have different op system than an 04 is there any reason why an 04 would generally have less perceived torque or grunt than the previous two years? Is this 04 like others or an anomay?

Questions one and two are not related to the same cars.

I appreciate you thoughts. Thanks
Bruce