After 7,500 miles, including some track time, I am still adjusting to the new V10's massive torque when in first and second gears (and occasionally in third). I can light the tires up anywhere along the torque curve after 3,000 RPM. If the throttle response was any more immediate, I'd be wrestling with the car all the time. As fun as that can be, as a steady diet I find it tiresome.
Criticisms of throttle 'lag' (or low RPM response), in my opinion, fail to take into account the cam profile of the new V10, which is intentionally docile below 3,500 RPM. As a first of its kind, the new variable valve timing cam-in-cam design trades F1 response at low RPM for daily driveability. Nevertheless, it bears mentioning that at 2,600 RPM the new V10 still makes more torque (475 lb.ft.) than the ZO6 at its 4,900 RPM peak torque output (470) so if one craves more torque than that between idle speed and 2,600 RPM, their preferences lean towards a more radical setup than the SRT crew envisioned for the street-legal GEN IV. My '08 coupe is a beast after 3,500 RPM, as intake/exhaust valve overlap increases and the engine starts to breathe freer (as RPM rise).
Drive your car for a while before rushing into performance 'upgrades' - you might find the GEN IV package a very nice balance of good road manners and brute performance when needed. Initially the car feels, and is, fast, but once broken in it's a different machine; mine reached puberty after approx. 3,500 miles. I estimate the pre-post break-in HP gain at 50; it felt like a different car when accelerating. Once you feel you have reached that point with yours, have it dyno'd. If it's putting out less than 500 lb.ft. at the rear wheels, it's not there yet. Once >500, you can decide better if you need more immediate punch.
I think the SRT engineers got it just right: a daily driver, 11-second street car (in average hands) with unbeatable track manners and a 200 MPH top end.
