Oddly, you'd think there would be more aftermarket support for the Hemi because the 5.7L Hemi comes in so many cars.
You can get a Gen III Hemi in a huge number of Vehicles: Across the entire Chrysler lineup the Hemi is probably available in more vehicles (though total sales may still be less) than the Chevy LS.
2003present Dodge Ram
20042009, 2011present Dodge Durango
2005present Chrysler 300 300C
20052008 Dodge Magnum R/T
2005present Dodge Charger R/T
2005present Jeep Grand Cherokee
20062010 Jeep Commander
20072009 Chrysler Aspen
2009present Dodge Challenger R/T
Chrysler has built over 2 Million Hemi's since its introduction.
A lot of people on these boards like the rarity of the Gen II hemi. But to me the ubiquity of the Gen III has made it relatively affordable. This affordability has led to a lot of aftermarket support. Is it as good as the aftermarket Chevy? No. But it is A LOT better than it was 20 or 30 years ago.
As far as putting an LS motor in my dart? No. The aftermarket support and price differential isn't that huge. If I wanted to own a Nova I'd have bought one of those.
Regards,
Joe Dokes