Yota- There was a little improvement when I installed the exhaust...though I did it at the same time as the EFI conversion so it is hart to tell if my performance gains were from the EFI swap or the exhaust. I really like the TRD header, but it was spendy even with my employee discount. The 2.25" exhaust is great, but the flowmaster is a little loud for my tastes.
Makohon- Yes, they're the 56" springs. I did end up moving the rear shackle hanger back, but only a little. I had a mehcanical engineering student buddy of mine do some math to optimize the hanger placement. The last 3 SAS's I've done for friends I've just left them stock and they work out great. The 4Runners sag a little, but nobody seems to mind. Its not like if I moved them the truck would sit level anyway...
-R-
