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[greggmo]

the only filter to buy is a k&n if you gonna go there. it can be cleaned and re-used so in the long term it will save ya a couple of quid.

[Oldsmoker]

Nah induction mods work. I've had my XJ40 done with K&N free flow filter, machined air flow meter, throttle body off a 4.0 litre jag, tuned inlet manifold and tuned (as in back pressure not noise) SS exhaust. THe car is significantly better.
Looking to do the same on the Jeep but with U.S parts it's half price.$2500-3000 gets all the breathing sorted. Keep the lift to 1-2", polyurathane bushes all round and some uprated shockers should get me 80% there.

[tim_aka_tim]

As Gregg said, the only benefit of a K&N or the like is that it will save a few pennies on paper filters over the years. Paper filters also filter much better. I had a K&N on my XJ and several other cars and it made no difference, just allowed more shit into the combustion chamber.

[Dave69]

if your not going to go off road in the XJ then fit an induction kit, otherwise dont bother and spend the money else where.

[Oldsmoker]

I'm doing my research via a book by Eric Zappe about modifying Cherokee XJ's seems to cover most bases.