[ATaylorRacing]

From my own experience I can tell you that a slightly bigger TB can give more HP and FE. The TB in the E-bay add would do both, but NO WAY are you going to gain 12 HP! The throttle plate is the same as stock and all they are doing is cleaning up the air flow going into the TB.

On a bone stock 3.0 liter V6 Dodge Shadow/Plymouth Sundance from the early 90s going from the stock 42mm TB to a 52 or 56 one off a 87 mini van with the same, but older motor picks up about .25 seconds in the 1/4 mile and from 1.2-1.8 mpg (1.7 in my case).

On my 98 SOHC Neon I went to a HUGE Indy Cyl Head intake and the FE stayed the same and I lost torque, but gained higher rpm power...no improvement in the 1/4 either (advertised a 25 hp improvement with a bigger TB.....So I bought the AF/X 60 mm TB and picked up a bit over 1/2 sec in the 1/4 and FE became nearly 2 mpg better.

On EVERY car I have owned.....if I was cruising, any air flow improvements into the motor made more FE and power....on MOST a better flowing exhaust did the same thing, but not on the V6...a better flowing exhaust made it have worse power and FE until I did a lot more mods....the stock set up worked the best initially.

What I have found is that with the extra power you can drive up to your speed easier and maintain it with less throttle = better FE.