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  1. R

    2008 GT, new exhaust, big mileage drop, help!

    Thanks Dan, I would agree with you, but I don't think I am qualified enough to tell by smell. It's better now that I am running the 91 and 91 perf tune. The car is better all the way around on the 91 with the perf tune and I am averaging about 20 which is still acceptable. I plan on doing a...
  2. R

    2008 GT, new exhaust, big mileage drop, help!

    Thanks Dan, I will drive it and trying the different tunes for a couple weeks and then call the other vendors for their thoughts if I'm still not satisfied. I see your point, I find those explanations really useful as I am still learing all of this computer crap. Man I miss carbs sometimes...
  3. R

    2008 GT, new exhaust, big mileage drop, help!

    I think it's to early to make major judgments, I just didn't see a night and day difference and people tend to claim and I had hoped to experience. I mentioned above that I needed to do more driving and that I have not yet used the 91 Octane tune. I understand that is really where you see...
  4. R

    2008 GT, new exhaust, big mileage drop, help!

    They sell different options. No tune is truly custom unless it's created for you on the dyno. That said, I looked at a few companies and went with SCT. They offer a few different options aned have dyno shops within range that can create me really cusom tunes I can use on my device. As far as AM...
  5. R

    2008 GT, new exhaust, big mileage drop, help!

    Got the tuner Allright, got the tuner. Tunes created: 87 econ 87 perf 91 perf I have loaded the 87 econ tune and I have tried the 87 perf tune and now my engine light is back off, no dtc codes listed. Exhaust still smells rich with either tune, though the engine does sound smoother. No...
  6. R

    2008 GT, new exhaust, big mileage drop, help!

    Ordered SCT sf3/x3 from AM at 379.00, including 3 custom tunes for my ride. Returning the JET MAF for $$$. Already established contacts with Seattle Dyno shops for custom SCT Dyno tune in the near future. I will provide feedback on performance once the tuner arrives. I thank all of your for...
  7. R

    2008 GT, new exhaust, big mileage drop, help!

    New question Ok, I have to verify one more thing. I talked to a CS Rep at American Muscle regarding a SCT tuning setup and my MAF issue. The guy on the phone recommended I return the JET MAF, pocket the money, and rely on the stock MAF with a tuner. He said that even though I am reading a...
  8. R

    2008 GT, new exhaust, big mileage drop, help!

    Dan, Thank you for that response, that makes some sense. I could understand needing a tune to some extent, but details like that help me to grasp the specifics. These sensors are I'm guessing about 14 inches further down from where they were before. That issue combined with all of the changes...
  9. R

    2008 GT, new exhaust, big mileage drop, help!

    Mil Elims They don't make them for the current cars per say. You can still buy them for the 96-04 models. I did some research and found that the sensors haven't been changed. I verified that the 04 mils worked for someone else, then I bought them for myself. :nice:
  10. R

    2008 GT, new exhaust, big mileage drop, help!

    Last night I put the stock MAF back in and went for a drive. I got a solid 19 highway driving. I usually get about 21 on that drive but this is better then the 17 I was seeing before. The exhaust still reaks and gives one a headache if the wind is right. I am working on the tuner, doing research...
  11. R

    2008 GT, new exhaust, big mileage drop, help!

    ok, so turns out, it's the leads that are color coded, not the sensors themselves. They do have different part numbers on the sensors themselves. I'll post that so if anyone ever needs it you've got it. Front o2 sensor middle number: 9F472 Rear o2 sensor middle number: 9G444 I will need to...
  12. R

    2008 GT, new exhaust, big mileage drop, help!

    O2 answer Yes all the sensors are in place and MIL eliminators have been installed. You know, at one point the installer swapped the front sensors with the rear sensors because his cables weren't long enough. "He goes they look the same expect they are different colors, so I just swapped them...
  13. R

    2008 GT, new exhaust, big mileage drop, help!

    I agree, You need a tune to take full advantage and I plan on going there, I just didn't figure I needed to at the time of install. I would have waited a little longer so I had the coin to do it all at once. Now I have to scrape some bucks up to get a programmer. Luckily summer is almost over...
  14. R

    2008 GT, new exhaust, big mileage drop, help!

    Yeah, the constant things I am hearing is "tune" and give the engine time to adjust, drive it, and the computer will catch up. Maybe that's the case. I am a little frustrated though, bbk advertises all of this stuff as "tuneless upgrades" So does Jet and K&N. I shouldn't have to tune it to make...
  15. R

    2008 GT, new exhaust, big mileage drop, help!

    STOMP ON IT!! LOL, I understand, I did that on the first day and saw the mileage dip down to 15.8. No today, I topped off, reset everything and went about some "normal" driving. I made sure to watch my shift point and not WOT, especially from low rpm. I am running between I'd say about...
  16. R

    2008 GT, new exhaust, big mileage drop, help!

    Hello, I am new to this forum. I have a 2008 Mustang GT, 4.6L 3V 5Spd manual. Previous engine mods were: K&N Aircharger AiRaid throttle body spacer Jet MAF sensor With this setup I was consistently seeing an average of 19-22 MPG during all normal driving conditions city and hwy. Oh, and 87...
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