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which headers for a lowered vert 99

This is a discussion on which headers for a lowered vert 99 within the External Engine forums, part of the LSx Technical Help Section category; I have a lowered WS6 convertible 1999. I need to get this thing breathing !! However I am concerned about ...

  1. #1
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    which headers for a lowered vert 99

    I have a lowered WS6 convertible 1999. I need to get this thing breathing !! However I am concerned about scrapping the pipes. I have a stock y pipe with flowmasters. Any advice would be appreciated as well as what to expect with install ie: 02 sensors etc.. Will I have to... or should I change the y pipe?

    Thanks in advance for the help.

    Patrick

  2. #2
    Member c5z28's Avatar
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    get some mid tubes if your really concerned with scraping, otherwise everyone other than slp make a good fitting header.

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    Member WS6ICK2K's Avatar
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    I really dont think you would have any problems with Pacesetter LTs. They tuck under my car VERY nice I dont think you will run into any problems. BTW Yes you will have to change the Y pipe with LTS, you might want to anyway cuz the stock Y is flat as a pancake.

    Advice on the instal
    Make sure you soak down the manifold bolts in a good penetrating oil, it will become your best friend.

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    thanks, I was told long tubes were out of the question. Can I expect to feel the difference ?

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    Quote Originally Posted by NitrOmm View Post
    thanks, I was told long tubes were out of the question. Can I expect to feel the difference ?
    Long tubes are the only way to go with any after market header. You will see the best gains in power and you shouldnt have any problems being lowered. Just know where you might scrape and try to avoid those areas. Having a vert wont make a difference.

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    Slow'er'Ass Mr. Luos's Avatar
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    Vert or not...
    I am lowered with Kooks longtubes. No problems.

    Just stay away from SLP and you will be fine.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
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    Member BlackSS1's Avatar
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    Quote Originally Posted by NitrOmm View Post
    thanks, I was told long tubes were out of the question. Can I expect to feel the difference ?
    American Racing headers fit well on a vert. I have 4.5" clearance, stock ride height, catted Y. You will have a little more clearance with an ORY.

    You can feel the difference, and hear it too

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    Member WS6ICK2K's Avatar
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    LTs are the best for hp on any car, after installing mine I will never change.

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    Thanks, you guys are a big help.
    Next question ...cats or no cats. Florida is not an inspection state. However, I am concerned of loosing too much back pressure ( for low end). Any thoughts ?

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    Member WS6ICK2K's Avatar
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    Quote Originally Posted by NitrOmm View Post
    Thanks, you guys are a big help.
    Next question ...cats or no cats. Florida is not an inspection state. However, I am concerned of loosing too much back pressure ( for low end). Any thoughts ?
    To save on $ I would probably go with no cats. Dont worry about the back pressure, you will gain a few hps without them. Just tune the codes out, or use 02 sims.

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    Member WS6ICK2K's Avatar
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    Also the sound will be deeper and have more volume.

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    Kooks lt's and y pipe on my 01 vert that's lowered --never had any prob.

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    Senior Member JonB's Avatar
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    I personally run mac midlengths and love them. People bad mouth them all day but I like them. They need work such as porting the primary because the welds are absolutly horrible on the inside of the primarys, I also cut off the ball flange and had a custom cated y-pipe made. My car also makes very solid numbers for its mods 358/369 at the wheels. #1 reason I got them was ground clearance, here in fl the roads suck, every damn shoping plaza has that nasty dip then and incline to get into the parking lot and then 50 f'in speed bumps in the plaza. My whole system tucks as tight if not tighter than the stock setup.
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    Member WS6ICK2K's Avatar
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    Quote Originally Posted by JonB View Post
    I personally run mac midlengths and love them. People bad mouth them all day but I like them. They need work such as porting the primary because the welds are absolutly horrible on the inside of the primarys, I also cut off the ball flange and had a custom cated y-pipe made. My car also makes very solid numbers for its mods 358/369 at the wheels. #1 reason I got them was ground clearance, here in fl the roads suck, every damn shoping plaza has that nasty dip then and incline to get into the parking lot and then 50 f'in speed bumps in the plaza. My whole system tucks as tight if not tighter than the stock setup.
    Nothing wrong with them, good set of headers.

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    Member Gundlach9's Avatar
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    Quote Originally Posted by 00WS6BlueMetallic View Post
    I really dont think you would have any problems with Pacesetter LTs. They tuck under my car VERY nice I dont think you will run into any problems. BTW Yes you will have to change the Y pipe with LTS, you might want to anyway cuz the stock Y is flat as a pancake.

    Advice on the instal
    Make sure you soak down the manifold bolts in a good penetrating oil, it will become your best friend.
    I've got the same setup - no problems...

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    Thanks for all of the advice, I have another question.
    While ordering the Pacesetters and OR Y, am asked if I want the EGR or not. I plan on having the 02 sensors tuned out .. is there an easy way to do away with the EGR also. Or should I leave it in and order that version of header with that aplication.

  17. #17
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    they can provide you a block off plate for the egr. Sounds like you will be getting block off plates for the air pumps. Might as well get egr with block off plate so you can smog the car if need be. If you have to they do have strictly off road headers with no air or egr provisions. Egr is easy to get rid of, you just need a plug for where the egr goes to the intake manifold. P.S having 02's is a good thing, they will help your car and tuner run at their most efficient.

  18. #18
    Member WS6ICK2K's Avatar
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    I just went with the Egr headers, I didnt want to mess with alot of that stuff.

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    Member cobrakiller99's Avatar
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    Quote Originally Posted by WS6ICK2K View Post
    To save on $ I would probably go with no cats. Dont worry about the back pressure, you will gain a few hps without them. Just tune the codes out, or use 02 sims.
    how do you tune the codes our or use the o2 sims?

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    One more question before I order ... EGR and A.I.R. or not. I have a choice on the Pacesetter LT ( quick trip) order the LT without the EGR & A.I.R. .

    Is there a benefit to keeping it?

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