zzze Posted May 3, 2010 Share Posted May 3, 2010 just out of curiosity what performance upgrades are there for an mj? Link to comment Share on other sites More sharing options...
kro10000 Posted May 3, 2010 Share Posted May 3, 2010 Stroker :dunno: Link to comment Share on other sites More sharing options...
75sv1 Posted May 3, 2010 Share Posted May 3, 2010 There are basically the same upgrades as the latter XJs. You might have to look a bit. Headers are available. Also, you can have your Renix Throttle body bored out. There was a guy in FL that did this. I did see him selling bored out TBs for latter ones recently. Upgraded wires. I think I used a Moroso Blue Max universall kit. I didn't find an upgrade for the coil though. I'd also say Ford 5.0L injectors. It would also depend on what year MY you have, ie Renix or HO. Tom Link to comment Share on other sites More sharing options...
dasbulliwagen Posted May 3, 2010 Share Posted May 3, 2010 Also depends on what motor you have, 2.1, 2.5, 2.8, 4.0 Renix, 4.0 HO Link to comment Share on other sites More sharing options...
Pete M Posted May 3, 2010 Share Posted May 3, 2010 also depends on what you've done to it and what you want out of it. dollar for dollar, gears will give you the best kick-in-the-rear power improvement. :thumbsup: (especially if larger-than-stock tires are involved) Link to comment Share on other sites More sharing options...
zzze Posted May 4, 2010 Author Share Posted May 4, 2010 well its a 4.0L Renix that has a 5 speed and it is an 88. Link to comment Share on other sites More sharing options...
Pete M Posted May 4, 2010 Share Posted May 4, 2010 then I'd go with gears. your biggest hamper to performance is the 3.07 gearing. Link to comment Share on other sites More sharing options...
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