go with steeda or SLP's for UPD's they are not piggybacks and are the best performing I also think March has a set as well, but id go with the 4.10's still dont have gears but I really want some. As for the Accufab plenum and TB I thought it was worth and I felt the performance it wasn't extreme but it was noticeable but don't get the 75-mm t.b. get the 70-mm unless you're planning to go FI. But id do gears first gears first still regret not getting them.
Hey Baker how much would you sell me the 3.73's for? are they in good condition, how long did you have them on the stang, and what brand really interested thanks