To fix the throttle response you either have to get a tune or one of those pedal boxes that modifies the throttle output signal. The cheapest and easiest fix to throttle lag is to just push the pedal more, just takes some time to get used to it.
As for the cold start up sound, I think it sounds great. The engine holds different rpms based on coolant temp (which can be adjusted with uprev) but it could also have something to do with vvel adjusting.
what exhaust do you have?
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