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I have EMGO filters on my XJ.. Pretty happy with them too. I think you loose a very slight amount of low end power but overall performance is improved. I ended up drilling out my mains but I can't remember what size. I want to say it was about 4 sizes up. If you're going to drill them, get very small bits and go up in increments. Do some color checks on the plugs. Just about all my color checks seemed like it was running slightly lean with high rpm chop tests.
I think you'll be happy with them. Parts'n'more has them.
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