[93mustang]

I have a 75mm Professional Products Throttle Body that came on my car. From all the posts I have read, it seems that it is oversized for my set up. I can get a used BBK 65mm throttle body from a friend of mine.
Would I see any performance gains by switching to the 65 or should I just leave the 75mm on?
I have read that your mass air size should be larger than the throttle body size. (i.e. 76mm mass air to 65 mm or 70mm throttle body) It should create a funneling effect.
I mainly use this car for Drag Racing and occasional short drives.


1993 GT Mustang / Stock 302 EFI / Edelbrock 5.0 Upper and Lower Intake / 75mm Throttle Body / C&L Cold Air w/76mm Mass Air / K&N Filter / Electric Fan / BBK Underdrive Pulley's / A.C. Removed / BBK Headers / Flowmaster / H-Pipe / T-5 / Alum. Driveshaft / 3.73 Gears / Eaton H.D. Posi / Moser 31 Spline Axles/ Subframe Connectors / Line Lock / Driveshaft Loop / B&M Short Throw Shifter / 16" Chrome Cobra Wheels / Nitto Drag Radials Rear / BFG G-Force Sport Front / Racing Upper and Lower Control Arms / Lakewood Adjustable Drag Shocks/ Holley 190 lph Fuel Pump / Holley Adjustable Fuel Pressure Regulator / MSD EFI Blaster Coil

[GTRaptor]

Yes, might be better if you use a slightly smaller TB, but i would say a 70mm not a 65mm.

With the switch you might not notice any difference....the main reason is that you are missing the most important part you need to take care of: HEADS.

So my recomendation, save the money for some good heads.

[WhiteSnow]

just supercharge the car than you want have to put out the money for a new TB :thumbsup