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  1. #1
    imp0ster's Avatar
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    4" front vs 4" rear stack with filter RXT

    Is there any advantage to me removing the extra 7ft of 4" Flextube and placing the filter just under the rear seat of the RXT? Besides it being way easier to remove and clean?


  2. #2

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    I have found filters cost you 60 to 100 RPM. Try it out yourself and see.

  3. #3
    imp0ster's Avatar
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    I run a large element but I'd like to remove the extra tube and get it out of the way of the way of my fogging the motor mount and that side of the engine.

  4. #4
    Eastside Powersports Slow 91's Avatar
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    my rxp had a kanaflex to the front, I swapped that out for a Riva Rear air and it was a night and day difference.

  5. #5
    RXPJAY's Avatar
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    I had 4" air to the front with a filter. Tested 4" solid rear with filter. You will pull in more warm air but I got 50-100rpms back! maybe because of the length or being smooth bore, i don't know. did not notice any drop on the boost gauge or changes in afr.Click image for larger version. 

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  6. #6
    imp0ster's Avatar
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    so is what I what to do essentially rear air? Just put like a 1.5ft run of the flextube with the large filter on it under the rear seat?

  7. #7
    imp0ster's Avatar
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    Quote Originally Posted by RXPJAY View Post
    I had 4" air to the front with a filter. Tested 4" solid rear with filter. You will pull in more warm air but I got 50-100rpms back! maybe because of the length or being smooth bore, i don't know. did not notice any drop on the boost gauge or changes in afr.Click image for larger version. 

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    that's exactly what I'm going for. Thanks

    I run frogskinz in the rear and front so it should help

  8. #8
    RXPJAY's Avatar
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    i am instaling 4" solid rear with jlewis adapter next. But this set up have been on all summer and its worry free.

  9. #9
    RXPJAY's Avatar
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    I run six frogskinz in the rear. I just bought a solid 4" aluminum 90 exhaust pipe with a coupling the the 4" sc adapter. You can get them in different length. I got 12" and measured it up, cut each side so it fit just under the rear seat vent with the couling on. think it was 30$ at an auto parts store.

  10. #10
    imp0ster's Avatar
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    I'll have to check clearance since I'm keeping the rear insert since it holds my first aid kit and sun screen. You also have a RXP. I thought the XT was different back there.

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