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Thread: FRPP Shorty Headers 4.6 4V Cobra Dyno Test

  1. #1
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    Thumbs up FRPP Shorty Headers 4.6 4V Cobra Dyno Test

    I have attached a professional dyno test review of the FRPP shorty headers on a Cobra 4V NA 10.5 compression engine. This is the closest engine dyno test to our MM engine I could find. The dyno tests were done by Richard Holdener in his book "Building 4.6/5.4L Ford Horsepower on the Dyno". The largest gains were 16 HP and 11 TQ at 6,500 rpm. (I could not find a 4.6 4V SC dyno test with the shorty headers.)

    I will post the LT 1 5/8" header NA dyno test later. It shows 18 HP gains at 6,100 and 19 TQ at 3,600 rpm. I will also post Cobra SC LT Hooker header dynos which shows 14 HP gain at 6,500 and 13 TQ at 5,800.

    I believe these test results prove the point that LTs are not the only header option open to MM owners, in fact for cost vs. performance the shorties win hands down at the high end.

    Keep in mind these are not the HP results you may get with your MM on a dyno. These are professional dyno tests in a controlled environment. But, you cannot ignore these results and simply write them off.

    OK ------

    Glenn


    Trilogy #124 SOLD - 8/2014
    11.80 @ 117.16 MPH: SSHS9
    1.74 sec - 60'
    443 RWHP/437 RWTQ
    "Stock Internal Engine" - Click Below

  2. #2
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    i wouldnt even consider those shorty headers, they look like glorified exhaust manifolds to me...


    2016 Ford Mustang GT PP - Lund nGauge, BMR vertical links, MGW Shifter, BMR CB005

    2004 Mercury Marauder - Eaton M112, Billetflow 3.4, Accufab SBTB + Plenum, T-56 Magnum, 4.10s, Stainless Works LTs, 2.5" Exhaust, Borla Stingers, Ridetech Coilovers + Adj rear shocks, FX-R projectors, Wilwood 13" BNSL6 + FNSL4 BBKs, S55 Gauge Cluster
    440rwhp & 406rwtq Tuned by Adam @ Revolution Automotive
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    (Sold) 2003 Mercury Marauder - Stainless Works LT's, Stainless Works 2.5" Catback, JLT Intake, Mo's Xcal4 Tune
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  3. #3
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    thats intersting

  4. #4
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    So Glenn you going to do this mod?
    2003 Mercury Marauder 300A
    FRPP BOSS50 Block w/MMR 900S Stroker 5.3L DOHC 324ci 10:1cr - (321rwhp/360.5rwtq) - Tuned by AED

    2006 Ford Mustang GT
    FRPP FR3 Handling Pack|FRPP X Pipe w/GTA Exhaust|Steeda CAI|Hurst Shifter
    (289rwhp/307rwtq)

    2003 Chevrolet Suburban 2500 LQ4 6.0L LT 4WD
    Cognito leveling Kit, Fox 2.0, BFG KOA2 Radial All Terrains, Magnaflow, K&N and 4.10 gears

  5. #5
    I have the same book lol. I will still be going with LT headers because I plan on moving a lot of air down the road.

    2004 Silver Birch
    300B
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    Exhaust by Greg
    13.630 @ 100.49 mph (11/21/10)

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  6. #6
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    Been there - Done that !

    I have had the the FRPP shorty headers for about 4 years with the Cobra X-pipe and coupled to the OEM mufflers, tail pipes and tips. See my Sig for the results.

    Glenn
    Trilogy #124 SOLD - 8/2014
    11.80 @ 117.16 MPH: SSHS9
    1.74 sec - 60'
    443 RWHP/437 RWTQ
    "Stock Internal Engine" - Click Below

  7. #7
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    Less HP !

    Quote Originally Posted by ctrlraven View Post
    I have the same book lol. I will still be going with LT headers because I plan on moving a lot of air down the road.
    I will post the LT Hooker headers on the Cobra 4.6 SC tomorrow. They show even less HP then the shorty headers with the SC engine.

    Glenn
    Trilogy #124 SOLD - 8/2014
    11.80 @ 117.16 MPH: SSHS9
    1.74 sec - 60'
    443 RWHP/437 RWTQ
    "Stock Internal Engine" - Click Below

  8. #8
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    Quote Originally Posted by Glenn View Post
    I have had the the FRPP shorty headers for about 4 years with the Cobra X-pipe and coupled to the OEM mufflers, tail pipes and tips. See my Sig for the results.

    Glenn
    What did that combo net you....I am going to have to address the exhaust once the the motor is in. What did that combo cost you? You think 2.5" or 3" piping?
    2003 Mercury Marauder 300A
    FRPP BOSS50 Block w/MMR 900S Stroker 5.3L DOHC 324ci 10:1cr - (321rwhp/360.5rwtq) - Tuned by AED

    2006 Ford Mustang GT
    FRPP FR3 Handling Pack|FRPP X Pipe w/GTA Exhaust|Steeda CAI|Hurst Shifter
    (289rwhp/307rwtq)

    2003 Chevrolet Suburban 2500 LQ4 6.0L LT 4WD
    Cognito leveling Kit, Fox 2.0, BFG KOA2 Radial All Terrains, Magnaflow, K&N and 4.10 gears

  9. #9
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    <--- gained 8mph in the 1/4 mile with LT headers


    11.90 @ 117.5mph on 93 octane
    324 shortblock, Novi 2000, Now with optional axle removing tires
    Igziabeher

  10. #10
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    Quote Originally Posted by RR|Suki View Post
    <--- gained 8mph in the 1/4 mile with LT headers
    What size pipes you running?
    2003 Mercury Marauder 300A
    FRPP BOSS50 Block w/MMR 900S Stroker 5.3L DOHC 324ci 10:1cr - (321rwhp/360.5rwtq) - Tuned by AED

    2006 Ford Mustang GT
    FRPP FR3 Handling Pack|FRPP X Pipe w/GTA Exhaust|Steeda CAI|Hurst Shifter
    (289rwhp/307rwtq)

    2003 Chevrolet Suburban 2500 LQ4 6.0L LT 4WD
    Cognito leveling Kit, Fox 2.0, BFG KOA2 Radial All Terrains, Magnaflow, K&N and 4.10 gears

  11. #11
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    Quote Originally Posted by bcastro View Post
    What size pipes you running?
    1 3/4" primaries, 3" collectors


    11.90 @ 117.5mph on 93 octane
    324 shortblock, Novi 2000, Now with optional axle removing tires
    Igziabeher

  12. #12
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    Interesting info, Glenn, thanks for posting.

    Do you see any adavantage going to LT with certain mod configurations? If not, then I think your assessment is spot on.

    2003 300B DBP
    Build date: 6/19/03
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  13. #13
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    NA LTs

    The NA LTs do show more HP and particularly TQ then the shorties at lower rpm. The greater torque at a lower rpm will get you off the line quicker. Greater HP at the top end will pull you across the finish line quicker. If money is no object then the LTs are a better choice - but very expensive. I am just offering professional dyno tests on these headers - the final choice is the members.

    bcastro:

    If you are to be only NA and have lots of money I would go with the LTs. Install them on the engine as you are pulling it back in the car. But, LTs show less improvements with SC engines. My dyno tests on SC LTs will explain why. 3" are not cost vs. performance effective and cost a great deal. 2 1/2" are more then sufficient.

    Glenn
    Trilogy #124 SOLD - 8/2014
    11.80 @ 117.16 MPH: SSHS9
    1.74 sec - 60'
    443 RWHP/437 RWTQ
    "Stock Internal Engine" - Click Below

  14. #14
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    Quote Originally Posted by Glenn View Post
    The NA LTs do show more HP and particularly TQ then the shorties at lower rpm. The greater torque at a lower rpm will get you off the line quicker. Greater HP at the top end will pull you across the finish line quicker. If money is no object then the LTs are a better choice - but very expensive. I am just offering professional dyno tests on these headers - the final choice is the members.

    bcastro:

    If you are to be only NA and have lots of money I would go with the LTs. Install them on the engine as you are pulling it back in the car. But, LTs show less improvements with SC engines. My dyno tests on SC LTs will explain why. 3" are not cost vs. performance effective and cost a great deal. 2 1/2" are more then sufficient.

    Glenn
    you gained 8mph in the 1/4 with shorties? I'd like to see that


    11.90 @ 117.5mph on 93 octane
    324 shortblock, Novi 2000, Now with optional axle removing tires
    Igziabeher

  15. #15
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    Quote Originally Posted by Glenn View Post
    I have had the the FRPP shorty headers for about 4 years with the Cobra X-pipe and coupled to the OEM mufflers, tail pipes and tips. See my Sig for the results.

    Glenn

    Glenn since you seem to be the duty expert. Will those ST bolt up to factory MM exhaust without modification, or is that why you went with the Cobra Xpipe??
    Don't bring skittles to a gunfight.

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