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Exhaust..need input

Discussion in 'Chevy Trucks' started by JAJA, Jan 3, 2015.

  1. JAJA

    JAJA Member
    Messages: 73

    What are guys thoughts.. I have a 2003 half ton 5.3 cold air intake, throttle body spacer, electric cool fans, straight pipe exhaust, and a custom tune. Here where I need your thoughts, my exhaust is rotted and tail pipe broke today. Should be able to get a new one made up Monday what do you guys think of shortie headers I'm asking because if I do that should I do something else with the exhaust from the cats back. The way the truck sounds now is perfect for me but if I can gain power then I might give on the sound
     
  2. rjigto4oje

    rjigto4oje PlowSite.com Addict
    Messages: 1,297

    Imo if its a plow truck and it has a 5.3 its got plenty of power your going to increase under hood temps i had a buddy the put headers on and he cooked plug wires like crazy
     
  3. JustJeff

    JustJeff 2000 Club Member
    Messages: 2,062

    I think you're wasting money on a twelve year old half-ton.
     
  4. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,003

    Just replace the pipe. Imo not worth the headers
     
  5. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,993

    If you decrease back pressure you will lose low end torque while maybe improving top end HP but the only thing guarantied is loud.

    IMO for a plow truck you want power not speed.
     
  6. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,993

    Why you wrap or ceramic coat them.
     
  7. South Seneca

    South Seneca Senior Member
    Messages: 474

    Headers are intended for helping the motor breath at high RPM. I had them on a truck I used to pull a decent sized boat and didn't see a any difference. I did have to change out burnt plug wires constantly, and mine were in the way of changing plugs to. Road salt eats them up pretty quickly to.
     
  8. rjigto4oje

    rjigto4oje PlowSite.com Addict
    Messages: 1,297

    When u wrap a header they have a tendency to rote
     
  9. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,993

    ???????????

    rote |rōt|
    noun
    mechanical or habitual repetition of something to be learned : a poem learned by rote in childhood.

    Did you perhaps mean rot?


    Yes wrap degrades the header much quicker, spray applications of ceramic paint help a little but have to be done every year or two because of flaking, the best bet is the Plasma spray ceramics. However again I wouldn't waste the money on headers unless I was looking for top end performance.

    Summit, Design engineering and many others have heat protection for plug wires, etc.
     
  10. rjigto4oje

    rjigto4oje PlowSite.com Addict
    Messages: 1,297

    yes I mean rot typing on a cell phone doesn't help the friend of mine that had headers on his dodge ram had nothing but problems he used msd wires with the heat resent sleeves like others have said it is not a good idea
     
  11. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,993

    Yeah My thumbs get in the way too:nod:

    I agree Headers are not the choice for work truck applications. Now one of my guys has a "R" spec Sentra with ceramic, wrapped headers and a much larger tube size exhaust and it made a BIG difference, but then again so did the drilled aluminum crank pulley and a mire of other enhancements.
     
  12. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,239

    If it were me I would do high flow cats and a good sounding muffler
     
  13. South Seneca

    South Seneca Senior Member
    Messages: 474

    Absolutely agree. High flow cats and Magnaflo mufflers help as much as anything.
     
  14. Banksy

    Banksy PlowSite Veteran
    Messages: 3,113

    x3 .... ....
     
  15. hosenfeffer

    hosenfeffer Senior Member
    from nh
    Messages: 124

    With custom tune in truck would you have to have redone. In my experience on bikes changing exhaust parameters /excuse the big word/ changes my tuning set up. Trucks? I put gas in em, plow and tow my toys.
     
  16. JAJA

    JAJA Member
    Messages: 73

    Yeah in theory if I did headers I would have to have reprogramming done. It is a work truck but also my every day driver my idea always was for more power with in reason but also improved Milage. I was happy with my dyno numbers when I got the tune 286 rwtq and 248 rwhp and have gotten 19.5 mpg once on freeway usually around 18.5 thought it be cool to get 20mpg but it is still pretty good
     
  17. carkey351

    carkey351 Senior Member
    Messages: 229

    if thats the mileage you have gotten, then you are lucky. i would just stick with the high flow cats and muffler and call it a day. if you want real performance you will have to give up mileage. no easy way to slice that out. they make supercharger kits, etc... but because you have to hit the pedal to make it faster (more power) you end up losing any mileage gains.

    my brother supercharged his monte carlo and he could gain 1mpg if he did not drive fast or use the power, but he also said it was very lame driving that way...
     
  18. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,239

    Did you change out the intake?
     
  19. JAJA

    JAJA Member
    Messages: 73

    K&N cold air, throttle body spacer, and a "ram air" set up (air box in one of the bumper slips with a 8" diameter tube going to the air filter. Plow blocks that so it doesn't help then