yea thats what the guy who works at the truckshop near my house told me too...Tundras with the vvt'i run best completely stock. he said sure putting on intake or exhaust gives you hp, but thats not what gives our trucks the power its the torque, and any mods you do hurt your torque. If it wasnt for the growling sound that my intake gives me, id be going back to stock in a heatbeat. On unichip's dynamometers they got the most power out of the 06's with a stock set up or only a cat back with the unichip..they got 330 tq and 300 hp with stock or cat back, and with intake and catback they got 315 tq and 300 hp, and with intake, raps, exhaust, and headers they only got like 290 tq and 270 hp...obviously the more you do to our trucks the more were just hurting them. i guess the only improvements would be the unichip, which shows no hp or tq loss and some decent gains (not sure for 700 its worth it), or a supercharger.... start savin up now