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Whats the size?

biggest I'd go with the flowmaster is 2.25 but i think the XJ's exhaust is slightly smaller maybe like 2 inch so in that case measure it and get an adapter.
 
exhaust should be 2.25, look for a flowmaster on ebay 80 bucks max, or search on google for one
 
exhaust should be 2.25, look for a flowmaster on ebay 80 bucks max, or search on google for one


or a thrush welded muffler same thing for half as much.
 
I have the flowmaster 40 on my rig... I wouldn't do recommend it. Loud, droning, doesn't sound very good and doesn't offer any performance advantage.
If I were a wealthy man, I'd sawzall it out and throw in something else.
 
2.25" is what the pipe size is after the stock cat. Dynomax has a 75$ rebate on their cat-back system, or I recommend something with a straight-thru design, like Bullet Performance/Magnaflow, Dynomax ultra-flo.
 
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