1990 MJ
NAXJA Forum User
- Location
- Puget Sound, WA
I have a ’90 4.0 MJ and can’t find a header to fit… What is everyone using?
X2 on Clifford. I am very happy with mine but you will have to redo your exhaust for it. I think all 4.0 headers will bolt up to any head just not the rest of the exhaust. The HO has a higher intake port not exhaust.
Ask clifford--their header is listed as a 87-05. I do know that Borla had a different header for 87-90, but maybe the only difference was the egr and not the bolt pattern or port location.
that looks exactly like a pacesetter headder !!
BTW i just went and cheaked via exaust/intakemanifold gaskets . the ports are exactly the same .
i put a old renix 89 gasket up aginst a 99 ho head and the ports line up just fine .the exaust manifols dose also so....im pretty sure any headder will work but youll have to delete the egr valve if you go to a 91 + header .
a put a pacestter on mine and i deleted the egr and saw no detrument to milage .
hope this helps !