180, you can buy a 74mm TB to install on the NA. Bulldogger sent his out and had it bored to 77mm(?) and a new butterfly installed. He has a SRT though. I have been thinking the same thing as you, but making the butterfly is a PITA. I am going to port match the manis this winter, so I may think about it again....

Here is the link to the company that bulldogger used...$175 isnt a bad price for this....

Maxbore.com throttle body boring service