I'm not sure about the "g", but I have a HTT Hx40 on my truck. It spools just a touch slower than the stocker, though, with my mods the stocker spooled so fast it was violent. The 40 definitely smoothed things out and made it more driveable. Now, I have an 02, not sure how much different it will be on your 05, hopefully someone else will chime in. You will notice more on the top end too, mine runs alot smoother and has more power above 24-2500 now, where the 35 was pretty much done. Probably runs cooler too, but I didn't get my pyro on till after the swap so I don't have anything to compare it too. Hope that helps.