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Old 09-13-2016   #1
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Join Date: Aug 2016
Location: tennessee
Posts: 4

GTA Year: 1991
GTA Engine: 350 TPI Automatic
tri-y header clarification

can't seem to find the answer and there is a lot of confusion on this question. Can anyone tell what size tri-y header was used on the SLP Trans AM GTA's for the 91 model year, 350 engine, as a dealer installed SLP option. I understand the 1 5/8" was used on previous model years up to 1989. The documentation on this site gives the part # for 90-92 header but not the tube size. Did they make any 1 3/4" tri-y's for later model years? Can anyone confirm that 1 3/4" was an aftermarket header size, but that the 1 5/8" was all that was used on the original SLP dealer installed option packages ?
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