OR...
They just choose this plateform because they like it? For what these guys have paid for decent GTP's, they could have had a 2v GT or an LT1 fbody. A large amount of these guys mod GTP's because they want to, not because they have to...you gotta respect that.
LS1's have a huge aftermarket following bruh. Maybe more then the 2 and 3 valve GT's. I'm not really sure, and that's kinda hard to determine either way. I went from 2v gt, to an ls1, back to a 2v, and now the 4v cobra I have now. And I want another LS1 someday.The swapping around had nothing to do with a lack of aftermarket, and it certainly didn't have anything to do with modular mustangs being a better plateform lulz...I just prefer mustangs.