whut is the stock size of the y-pipe on my 86 WS6 TA, is it a 2.5" or a 3" or either of those????

 

britered86transam,
I went out and measured what I think is the Y-pipe which comes off the exhaust manifolds. The circumference of this pipe is nine and half inches and three and half inches across. I have the LB9 engine. I took the measurement at the right front jacking point or right across from it on the pipe.

Chet

 

i got the 86 305 tpi ws6 ta and i also have that awsome exhaust i believe the 86 tpi exhaust was better than the 85 but the diff is in the cam