View Full Version : exhaust manifold

08-29-2011, 08:50 PM
is the 89 xj 4.0 exhaust manifold and down pipe the same as an newer tj 4.0:confused0006:

08-30-2011, 03:58 AM
I know the dual downpipes are different but not sure about singles

08-30-2011, 08:17 AM
Simple answer, no.
87-90 is Renix and has it's own exhaust manifold design. 91- early 99 is still a stainless tubular design similar to the renix but the collector is in a different orientation and the does not have the provisions for an O2 sensor or the egr tube that the renix has. The exhaust ports are the same for these 2 and the manifolds can be interchanged with some work. Late 99 up has a dual cast iron manifold set but the exhaust ports are shaped differently and placed higher in the head so this manifold set will only work on late 99 up engines