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Old 09-22-2016   #7
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Join Date: Oct 2001
Location: Bakersfield, CA
Posts: 133

Re: tri-y header clarification

1 5/8" is what I had on my 92 305. In the late 90s when I contacted SLP for some parts like the install kit and C.A.R.B. sticker, 1 5/8" was all they mentioned having for the longest time.

I don't think it was a matter of one size being the aftermarket and the other being the size sold thru dealers, I think the 1 3/4" were just phased out of production after not long.
__________________ - 1992 Pontiac Trans Am GTA. 1969 Firebird. 2014 Ducati 899
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