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How much more?

This is a discussion on How much more? within the Firebird / WS6 forums, part of the Vehicle Specific category; Good morning. Opinions on how much more power from a lid and catback together?? At the rear wheels....

  1. #1
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    Spiral Gray
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    How much more?

    Good morning. Opinions on how much more power from a lid and catback together?? At the rear wheels.

  2. #2
    Junior Member PGH_WS6's Avatar
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    2002 WS6

    Cat back itself does not add much power at all. Together with the lid I would say around 10 -15 at best.

  3. #3
    Member blk_jaws's Avatar
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    Black on Black
    2000 Trans Am M6

    I dont know if the lid would show anything on the dyno though IMO, but it does help
    SLP LT's, SLP High Flow Cats, 3" Flowmaster CB, Comp Cam, SLP Lid, LS6 Intake, BBK 80mm TB, SFC, Ram Air HO Hood, Lowered, Torq Thrust II's

  4. #4
    Senior Member GULLETT17's Avatar
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    00 TA PWTR, 98 VertTA NBM
    80 TA BLK, 80 Formula NBM

    depends on the catback . . . but lets say magnaflow, slp lid, and a new paper filter, prob pushin 10-12 rwhp

  5. #5
    Firebird Encyclopedia 9T8W66's Avatar
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    Navy Blue Metallic
    `98 Formula M6 HdTp

    Combined there good for an easy 10-15 HP at the wheels.
    Craig
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  6. #6
    War Machine BIG GUNS's Avatar
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    I noticed quite a bit of diff by putting the magnaflow muffler and clear slp type lid on. Not sure how much though.

    Roars louder and the kick is more violent. Shaved my Quarter mile time by about half a second. I am an amateur racer though. I also added the JAAM RAM plenum from WS6 store which channels the air flow better too I think. I just looks cleaner which is what I was concerned with.

    You will notice a difference though.

  7. #7
    Senior Member Too Fast's Avatar
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    2000 WS6 6spd Hooker LT

    I've seen that a lid by itself is ~10 HP, and a good cat-back the same. Put together, tho, the gain is about 15. For some reason, usually the things that add 5-10 HP each don't give a cumulative effect. Diminishing returns....

  8. #8
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    Thanks guys. Now if it keeps starting up !!

  9. #9
    Member Since 1998 Mecinoid's Avatar
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    '98,'00 Bird '03, 14 Vets

    One of the best mods I have made is a ported / polished thottle body. Cheap mod too. There is only a little more HP made but the thottle response and the car jump is much better. Because of the thottle response I can chirp third just by stepping on the gas down low in third without drag radials on her. It's great for races on the roll. The front end pops up and your gone. Not nearly the lag of a stock thottle body.

    Last edited by Mecinoid; 11-19-2008 at 01:25 AM.

  10. #10
    Member herculesrider1's Avatar
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    '00 TransAm RamAir WS6 M6

    Quote Originally Posted by Retired Cop View Post
    Thanks guys. Now if it keeps starting up !!
    What's sad is going someplace and parking SO THAT you can either roll downhill and pop the clutch or parking in a way where someone can get behind you and push you. Mine has been starting everytime, but my fingers are still crossed....

  11. #11
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    Spiral Gray
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    So far so good , did u change any parts??

  12. #12
    Member herculesrider1's Avatar
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    '00 TransAm RamAir WS6 M6

    No, I haven't replaced anything yet. Have been following your posts to find out what it actually is. Mine is out of warranty, so anything I replace, I have to pay for myself. If I can fix it myself for the cost of an inexpensive part, I'll gladly do it! Appreciate you keeping us up to date on what you find!

  13. #13
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    Spiral Gray
    2004 Auto Corvette

    Talking

    I have changed the ignition switch and the ignition lock, so far its been a little over a week still starts every time.

  14. #14
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    Black on black
    2000 Trans Am WS6

    Hey "Mecinoid" did you do the port and polish job? It looks good. I am thinking about sending mine out to have it done for $75.

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