i got a 2.5 inch mandrel bent up and fitted to our landcruiser at a local exhaust joint for the same price as a cheap kit one off ebay which i would still have to fit and also have no warranty on fitting.
for those interested in air filters, a mate and i tested the three main types on our rally car, my mate had access to a dyno and so we tested them all back to back on the same day on the rolling road. the engine was normally aspirated. best performance was the paper, then the k&n, with oiled foam last. out on the gravel, the cheapest to maintain and best water repellent was the oiled foam followed by the k&n with paper last.
what would i use in a 4wd? oiled foam all day every day, the performance gain of paper or k&n in a 3 tonne peice of steel is insignificant compared to the water repellent properties and ease of servicing of oiled foam, you can service it anywhere with akmost any solvent and pretty much use any oil to oil it.
what did i use in my rally car? k&n but only because it provided the best compromise in performance and i serviced it enough to make it cost effective over paper, but servicing cost is more than oiled foam because you have to use the proprietry oil and cleaner.
what would i use in a normal sealed road car for best performance? paper and replace it at every service.
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