The questions posed here about which "Punch 45" the OP is referring to is valid. There have been several iterations of the Punch 45 since 1985 and most recently the 2005 Special edition version called the "25 to Life" Punch 45. Most versions of the Punch 45 put out 130-150w bridged at 4 ohms with exception of the "25 to Life" version as it does 260-280 bridged at 4 ohms. Although not rated to handle 2 ohm mono loads, most could but don't put out much more than at 4 ohm bridged.
As for the "1000 watt" Sony Explod, I have no idea what power it actually puts out, but most likely in the 200-300w bridged RMS range.
I'm planning at some point in the future to test some of the cheap, big power rating amps from Sony, Boss, Power Acoustik, etc. to see what kind of continuous power they put out as "Max" means nothing. Most of us know many of these amps are basically junk, but based on the sales numbers of these amps it would be nice to show people what they are actually buying...