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Advice for first mods

This is a discussion on Advice for first mods within the External Engine forums, part of the LSx Technical Help Section category; So heres my situation. I recently acquired a bone stock 98 Z28 and I am planning to do some work ...

  1. #1
    Junior Member phoenixXIV's Avatar
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    '98 Z28 M6

    Advice for first mods

    So heres my situation. I recently acquired a bone stock 98 Z28 and I am planning to do some work to it in December. Thing is I'm away at college so this will probably be all that I do for a year or two. I'm thinking small, but hey, I gotta start somewhere. I'd like some advice for what to do with my exhaust. (I'm not doing anything else performance-wise for the time being, but I have big plans for the future)

    The way see it I can get either:
    1. CAI and catback
    or
    2. Headers and true duals (should I get TSP or custom? Dumped?)

    I'm thinking option 2 but I just want to hear some honest opinions.

  2. #2
    215 heads,ms4cam,102 fast 2000ls1tranz's Avatar
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    i would do #2 headers ...i have tsp x pipe true duals an like it... going to also do a custom setup to it run it all the way back with the bullet muffles an have 2 cutouts before the rear...will let ya know how it turns out if ya want ...getting done monday

  3. #3
    TerribleTed TerribleTed's Avatar
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    Quote Originally Posted by phoenixXIV View Post
    So heres my situation. I recently acquired a bone stock 98 Z28 and I am planning to do some work to it in December. Thing is I'm away at college so this will probably be all that I do for a year or two. I'm thinking small, but hey, I gotta start somewhere. I'd like some advice for what to do with my exhaust. (I'm not doing anything else performance-wise for the time being, but I have big plans for the future)

    The way see it I can get either:
    1. CAI and catback
    or
    2. Headers and true duals (should I get TSP or custom? Dumped?)

    I'm thinking option 2 but I just want to hear some honest opinions.
    >Do a full compression check first to see if you have good psi's, then replace at least your valve springs with some decent ones (not stock ones),,,then you can at least have a car that will take repeated hits (that is mis shifts and over revs) before and or after you up the exhaust system...and dont forget that tune after you free up that exhaust,,

  4. #4
    Moderator 35th-ANV-SS's Avatar
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    Your very first mod should be sub-frame connectors...

    THEN you should do exhaust and a lid. If money allows, LTs. If you get LTs, go stainless steel if you can afford it. Kooks and ARH are the best. Middle of the road (not SS) is Pacesetter.

    Exhaust....really depends on what your "big plans" are down the road. If you are putting in a cam, GMMG sounds wicked.

    I really am starting to like the dumped pre-axle look.

  5. #5
    LS WON camaro02sprspt's Avatar
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    option 2 i love it, bullets dumped

  6. #6
    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    Your very first mod should be sub-frame connectors...
    +1

    I wouldn't bother with CAI, money can be spent better on other things.

  7. #7
    Junior Member phoenixXIV's Avatar
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    Quote Originally Posted by 2000ls1tranz View Post
    i would do #2 headers ...i have tsp x pipe true duals an like it... going to also do a custom setup to it run it all the way back with the bullet muffles an have 2 cutouts before the rear...will let ya know how it turns out if ya want ...getting done monday
    Definitely. Let me know how it goes.

    Quote Originally Posted by 35th-ANV-SS View Post
    Your very first mod should be sub-frame connectors...

    THEN you should do exhaust and a lid. If money allows, LTs. If you get LTs, go stainless steel if you can afford it. Kooks and ARH are the best. Middle of the road (not SS) is Pacesetter.

    Exhaust....really depends on what your "big plans" are down the road. If you are putting in a cam, GMMG sounds wicked.

    I really am starting to like the dumped pre-axle look.
    Quote Originally Posted by KMdef9 View Post
    +1

    I wouldn't bother with CAI, money can be spent better on other things.
    Suspension/chassis/drivetrain, etc will be the first thing I take care of before any more performance mods.
    Last edited by phoenixXIV; 09-17-2010 at 12:37 PM.

  8. #8
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    Air coming in, air going out. Air intake, exhaust. Then if you want your car to obnoxious go with the long tube headers and no cats. For starters, exhaust and air intake. And a hurst shifter would help also. If it is a daily driver, I do NOT recommend long tube headers. But hey, I am over 40!

  9. #9
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    I would go with a CAI and headers instead of the true duals. A stock engine isn't going to see much, if any, gain with a true dual setup, but headers and CAI would help get more air and fuel in, and spent gases out.
    Had a 1994 Pontiac Formula:
    Patriot Red - hooker headers -1.6 Crane RR's And More

    Looking to get an LS1 Pontiac Firebird Trans Am

  10. #10
    Moderator 35th-ANV-SS's Avatar
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    I personally don't think CAI do much for our cars...and honestly don't see too many people on here that run it. I've been wrong before though.

  11. #11
    Senior Member tatertot91's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    Your very first mod should be sub-frame connectors....
    Right there with ya on the SFCs, should be the first mod

    As far as performance:
    #1: Take care off all the free mods, keeps you busy for a short period of time and doesn't hurt your wallet
    #2: Lid - cheap, cleans up engine bay a lot
    #3: Catback - I would recommend magnaflow, tame at idle/light throttle, screams at WOT (sounds great after headers/ORY)
    If you want an extremely loud car go true duals but being as i drive in and out of my neighborhood at odd hours morning/night i wanted something relatively tame
    #4: Seeing as you have a 98 i would recommend an LS6 intake, can be had for a decent price if you shop around, relatively easy install
    #5: Headers and an ORY, preferably longtubes.
    Last edited by tatertot91; 09-18-2010 at 10:56 AM.

  12. #12
    Junior Member mrc54's Avatar
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    #1 LCA relocation brackets. I have done the SLP lid, smooth bellows, Fast toys air scoop, they all added power, but it's no good if you can't put the power to the ground.
    Last edited by mrc54; 09-20-2010 at 07:25 AM.

  13. #13
    I think I would to long tubes first with a lid. The factory exhaust isnt that bad. I dont think I gained any noticable power going from the stock ws6 exhaust to hooker.

  14. #14
    Moderator 35th-ANV-SS's Avatar
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    I did not have a before DYNO pull so I don't know where my car was stock...but the only power adders I have on my car are Kooks 1-7/8" LTs, a Kooks ORY, Exhaust, and a lid.

    I DYNO'd 330rwhp and 342rwtq on a Mustang DYNO which reads lower than a DynoJet.

    That is going through a 9" rear end, which is 6% less efficient than the stock 10 bolt.

    Personally, I think LTs and exhaust together will net you about 25-30rwhp. The stock manifolds and y-pipe are pretty restrictive on our cars.

  15. #15
    LS WON camaro02sprspt's Avatar
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    when i did my PC LT and exhuat i had a big jump in power, but no DYNO charts to go by, just feel...but i also agree with 35th-ANV-SS and doing SFC....wishing that i did that too, now i have fish eyes on my rear quarter panel.
    Last edited by camaro02sprspt; 09-20-2010 at 03:36 PM.

  16. #16
    Member bberretta's Avatar
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    First, do all your free mods. Suspension and brakes second- it doesn't matter if you add 1000 hp onto your car if the frame tweaks and you can't stop it. Start with sub frame connectors- bolt in 2 points are inexpensive and well worth it. Then focus on intake and exhaust.
    2000 Pontiac Firehawk #0041 of 742

  17. #17
    Quote Originally Posted by 35th-ANV-SS View Post
    I did not have a before DYNO pull so I don't know where my car was stock...but the only power adders I have on my car are Kooks 1-7/8" LTs, a Kooks ORY, Exhaust, and a lid.

    I DYNO'd 330rwhp and 342rwtq on a Mustang DYNO which reads lower than a DynoJet.

    That is going through a 9" rear end, which is 6% less efficient than the stock 10 bolt.

    Personally, I think LTs and exhaust together will net you about 25-30rwhp. The stock manifolds and y-pipe are pretty restrictive on our cars.
    Ya I read an article where 30rwh was picked up just with LT's and a 3" Y pipe. I believe the catback only picked up about 3rwh. They said the stock ws6 cb flowed surprisingly well. My guess is more hp would be freed up on a base model ta/z28.

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