The factory Hemi TBs are still relatively weak by today's standards. They are not overly stiff at all. Consider at least about a 1.12 for notable improvement.

I've run many different diameters... settled on 1.24" (largest that will fit inside the hex opening... still not bad for street/highway... just avoid potholes and go slow over train tracks. My Challenger is setup for national level competition AX, HSAX, HPDE... and driven to/from the events.

Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!