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  1. #1 Re: p0420 
    GT Level Member sirricealot's Avatar
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    Welll i got the magnaflow because it was either that, a universal, or dealership. I may just save up for a tune and do it myself...seems pretty easy. Im guessin hp tuners is the best?
    2008 Grand Prix GXP 5.3L V8 (DRUNYON)
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  2. #2 Re: p0420 
    GXP Level Member 91parkave's Avatar
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    Quote Originally Posted by sirricealot View Post
    Welll i got the magnaflow because it was either that, a universal, or dealership. I may just save up for a tune and do it myself...seems pretty easy. Im guessin hp tuners is the best?
    I like HP tuners but efi live is out there That have the ability to turn off the code and test in the pcm. You can request the same from diablo and trifecta As well
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  3. #3 Re: p0420 
    GT Level Member sirricealot's Avatar
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    Quote Originally Posted by 91parkave View Post
    I like HP tuners but efi live is out there That have the ability to turn off the code and test in the pcm. You can request the same from diablo and trifecta As well
    I'm looking for the most affordable and practical solution for this issue. I'm hoping it shuts off when i get the o2 sensor replaced. I dont think it was because of the cat, i had the car 10k miles before the cel turned on and it had a universal magnaflow welded in. I just bought the bolt on magnaflow for it.
    2008 Grand Prix GXP 5.3L V8 (DRUNYON)
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