Does anyone know if the spacer that goes between the driverside exhaust manifold and the y pipe is the same on 87-92 L98, LB9 and LO3 engines?

And did all 87-92 tpi engines, have bigger exhaust manifolds than LO3 engines?

My brothers 92 firebird lo3 has a 3" cat back, 3" catco and 89 tpi single cat y pipe laying around, I thougt he could put the bigger tpi exhaust manifolds and use the bigger y pipe for a little more performance.

Thanks for any advice.

 

Someone know the sizes of the tpi spacer?

 

Perhaps the following link will provide some insight:

https://www.thirdgen.org/forums/exha...-question.html

JamesC

 

Thanks JamesC, altought I have already read it before, reading it again provided some insight.
Still hope someone has a larger tpi manifold spacer for coreect dimensions.
I have the lo3 spacer and ID is around 2.17" and hight around 0.40".