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What is a good Throttle Body to get for a foxbody? Mine is leaking boost out the top under the tps sensor.
 

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I once intentionally ran a dyno test with the bypass (1") open - it only lost 3 psi and 30 hp. You're talking about a leak several orders of magnitude smaller - i.e. effectively unmeasureable. It'll start to affect your idle long before it'll affect your power.
 

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I had to seal mine and modify my sensor.

Not because of the leaked air, that is meaningless, but because all the leaked air pushed crud into the TPS and made the TPS constantly fail.

If you are not having sensor failures don't worry, but if you are eating up sensors (I would have to clean mine after trip to the track and replace it every few trips) you will have to make some mods. There are a number of ways to reduce the air blowing into the TPS if it is giving you failures.

Since I modified mine a few years ago I have not had to touch the TPS sensor. I have an Accufab and use the Ford OEM sensor with my Holley EFI. But that is the only reason I would worry.
 
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