Which one should I get first? Which one gives better gains? How hard exactly is the Underdrive installation, and what tools are needed guys?

Thanks

Also, where do you go to get the ARD TB.

CAI | GS-t Muffler | AFX UDP! | And occasionally no PS

Performance wise I think the UDP is the better choice, but the TB is easier to install and it cost less (assuming that you get yours machined). If you are just doing the UDP (and not a complete 60K service like some do) then it should only take a few hours to do the UDP install.



Eric Madden

I've had a udp and I've had a bored TB (with a nice intake) and I don't know about the actually numbers.. but the TB with an intake made the car feel so much more powerful (and sounded cool as hell) compared to the udp.