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  1. #1
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    Suggestions for running 6.1 manifold with 6.4 Procharger plumbing

    Going to be switching to a Holley sniper which has the flat throttle body position like the 6.1 manifold, I have a 6.4 Procharger kit and the way the plenum and piping is it will not work directly with the new manifold. Any ideas without having to buy the 5.7 plenum and pipe from Procharger? Iv seen some one on here for sure use couplers and make like an s bend to make the 6.4 plenum work with the 6.1 manifold. Any tips would be appreciated or if anybody knows who that is lol I just want to see the routing.


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  2. #2
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    get a cold side made up. or a wedged Tb spacer. Either should not be too expensive.

  3. #3
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    Best thing would be to get a new pipe fabricated to match up. Excessive silicone couplers trying to make it match up is silly.
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  4. #4
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    If you're set on building your own, Spectre Performance offers extruded / polished aluminum tubing in various lengths and angles. If you're diligent and take precise measurements (segements butt up against each other), you can fabricate a constant-diameter 100mm intake tract with no ID changes. With the proper Vibrant silicon / Aramid reinforced couplers, it can look good and more importantly is boost-proof:


    Last edited by Hemissary; 08-12-2019 at 09:26 PM.
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  5. #5
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    Quote Originally Posted by Hemissary View Post
    If you're set on building your own, Spectre Performance offers extruded / polished aluminum tubing in various lengths and angles. If you're diligent and take precise measurements (segements butt up against each other), you can fabricate a constant-diameter 100mm intake tract with no ID changes. With the proper Vibrant silicon / Aramid reinforced couplers, it can look good and more importantly is boost-proof:
    Are those heat shrink clamps on the couplers?

  6. #6
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    Quote Originally Posted by DBL.DWN View Post
    Are those heat shrink clamps on the couplers?
    Yes, I slid colored heatshrink onto the clamps, shrank it then installed them.
    Last edited by Hemissary; 08-13-2019 at 11:37 AM.

  7. #7
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    As Simon has described in his post, getting "precise" cuts that accurately butt together requires a machine hacksaw (the kind used to cut exhaust pipe). This is very difficult to do by hand. Once cut, the pieces need to be deburred using a machinist knife or equivalent. Time and patient are mandatory.

  8. #8
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    Quote Originally Posted by richierevs View Post
    As Simon has described in his post, getting "precise" cuts that accurately butt together requires a machine hacksaw (the kind used to cut exhaust pipe). This is very difficult to do by hand. Once cut, the pieces need to be deburred using a machinist knife or equivalent. Time and patient are mandatory.
    That can all be done with an angle grinder, pretty easily as well as quick and precise. As long as you measure correctly. With a grinder you can cut slightly bigger a grind it down to perfection if you are not confident.


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  9. #9
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    Quote Originally Posted by ronan978 View Post
    That can all be done with an angle grinder, pretty easily as well as quick and precise. As long as you measure correctly. With a grinder you can cut slightly bigger a grind it down to perfection if you are not confident.


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    This. And if you’re going to pie cut it. You need matching angles to butt together.


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  10. #10
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    Use welding rod to first plot the centerline of the path you wish the tubing to take. This is easier than one might think; don't worry about the curved portions, just use straight pieces and tack weld at the angle change. Once finished, you can measure each rod to determine the exact lengths required.

    Using die grinder is fine is you simply take a piece of paper or thin cardboard with a dead-straight edge and wrap it around the tube at the point you wish to cut. Line up the paper / cardboard so they exactly overlap, then use a Sharpie to scribe along the edge. This will give you a cut that is perpendicular and flat...if you know how to use the grinder :^)

    The elbows are just as easy when using the welding rod template. The template gives you the angles required at each end as well as the where you wish to the ends to meet up with other straight or curved portions.

    If you design the intake tract with as few bends as possible, the aggregate drag forces are reducing accordingly. For those building a system for a NA engine...it is absolutely imperative to install a velocity stack to condition incoming air flow right at the filter attachment point. Otherwise you are leaving significant HP / TQ for all the reasons mentioned in this thread.

    In the pic below you see a throttle body with a silicon reducing coupler (disregard), with a decent velocity stack with a 100mm ID. You can build your own filters at AFE to whatever shape you want. In my case, it has an opening of 175mm (7") that slides over the flange (always use as large a filter element as possible that will fit within the confines of the inner / front fender cavity)...



    Even with a 100mm ID intake tract, if the filter end of the intake tube simply ends, you can count on losses increasing as rpm and air velocity) increases...
    Last edited by Hemissary; 08-16-2019 at 04:05 PM.

  11. #11
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    Quote Originally Posted by Hemissary View Post
    ...For those building a system for a NA engine...it is absolutely imperative to install a velocity stack to condition incoming air flow right at the filter attachment point. Otherwise you are leaving significant HP / TQ for all the reasons mentioned in this thread...


    This is gold...


  12. #12
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    Quote Originally Posted by richierevs View Post


    This is gold...

    case and point



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  13. #13
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    It's on my radar one of these Winters to pull the intake tract, bevel the ends of the four sections and butt-weld them together. Then, grind / smooth / re-polish to represent what you already see or, apply some sort of decorative coating that is in-keeping with the rest of the engine / engine bay.

    The impressive part of re-polishing would be that the final (integrated) part then looks like it came that way. Just ups the custom / functionality aspect to the next level...
    Last edited by Hemissary; 08-16-2019 at 08:13 PM.

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