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throttle body size

This is a discussion on throttle body size within the General Help forums, part of the LSx Technical Help Section category; I believe the stock size throttle body is 75 mm for my 99 ta if i go bigger to a ...

  1. #1
    Junior Member
    Join Date
    May 2009
    Livonia mi

    1999 trans am

    throttle body size

    I believe the stock size throttle body is 75 mm for my 99 ta if i go bigger to a 85 mm will i need any adapters? Or will it fit right up also is it the same if i get a larger maf sensor?

  2. #2
    Join Date
    Oct 2007
    Beaver Dam KY

    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Stick with the stock stuff until you are ready to go with the FAST intake(90mm) gains are minimal and a ported TB and the stock MAF are the way to go.

  3. #3
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005

    1999 TA WS.6

    Wheather you change anything about that area, the bellows ( assume this is what your asking about) will fit. With my 92mm FAST and 92mm PTM TB.... they fit. Its really tight, but it works. Dont worry about changing the MAF out. No gains, money better spent else where.

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