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Re: 2.5L performance?
I can't imagine any single performance mod for a 2.5L costing $600 and being worth it.
That said, I had mine running pretty good on 32's with an opened intake (removed airflow restrictor and installed a drop-in K&N), a performance muffler, splitfire plugs, elec fan conversion, and I think I'm forgetting something else but these are it for the most part.
None of the above-mentioned mods will knock your socks off, but done together they can get an old 2.5L running pretty good even with 31-33" tires. They won't win any races but I consistantly got 20 mpg on the highway in my old YJ.
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