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Recent content by MM704

  1. MM704

    Looking for muffler advice/opinions

    So I brought my '00 GTP into the shop this week for an oil change and a sticker, and I asked them to check my exhaust system because I could tell there was a leak. Turns out my 17 year old cat back was rotted out and needed to be replaced, so they went ahead and replaced the entire cat back...
  2. MM704

    HUD shaking at 2k RPM?

    So my 2000 GTP's heads up display shakes a lot (the display itself shakes - the dash, steering wheel, etc. don't) at about 1900-2000 RPM on the highway and only then. It doesn't shake if I'm coasting or WOT. What could be the cause of this? I know the little exhaust piece that connects the...
  3. MM704

    Another GM recall for 3800 engine fire

    I just got the new recall # 15757 in the mail today. It looks like GM changing the spark plug wires, as done for the previous recall, didn't fix the fire hazard caused by hot engine oil leaking through faulty intake manifold gaskets (shocking). Not only that but they still haven't come up with a...
  4. MM704

    What are the best tires for my GTP?

    What are some of the best tires for a 2000 GTP coupe? It has the stock 16 inch wheels so the tire size is 225/60/R16. I currently use Goodyear Eagle GT tires for spring-fall and Firestone Winterforce tires for winter. The Winterforces are great in the snow so I'll stick with those for winter. I...
  5. MM704

    Engine noise, possible worn supercharger coupler?

    I've noticed within the past couple of weeks that when my GTP is idling it makes a bit of a knocking sound. Could it be a bad supercharger coupler? I've heard that they tend to go bad on these. Hopefully it's nothing more serious I take pretty good care of this thing. I'm running a 3.5 press on...
  6. MM704

    May need new resonator... glasspack?

    So tonight I noticed the exhaust on my GTP was pretty loud. I took a look underneath and sure enough my resonator (2nd resonator this car has had, original one rusted out) has a crack in it towards the front (maybe two or three inches long), pretty close to where the resonator and the downpipe...
  7. MM704

    F-Body calipers... will spare tire fit over them??

    So I ordered an F-Body front brake kit for my 2000 Grand Prix GTP and they are scheduled to be installed this week. It recently struck me: will my stock spare tire fit over these brakes? Its size is T125/70D15. I'm still using the stock rims (225/60R16) but I know those will fit over the brakes...
  8. MM704

    Aeroforce gauge shows 330 horsepower??

    So my 2000 GTP is running with a 3.5 inch sc pulley, 3 inch catd downpipe, plog, cai, colder plugs, 180 tstat, and Overkill PCM. According to my Aeroforce Interceptor scan gauge, my engine is consistently producing around 330 horsepower at WOT right around 6000 RPM. How accurate does this sound...
  9. MM704

    3.5 setup... what is the best spark plug? Can't figure out heat range...

    So I have a 2000 GTP with 117k miles. It has a 3.5 inch supercharger pulley, PLog, 3 inch downpipe, CAI, 180* thermostat, and Overkill tune. I'm currently running AC Delco 41-104 plugs (from CTS-V, ZL1, ZR1) gaped at .045, which was personally recommended by Will Overkill for my setup. My KR...
  10. MM704

    Spark Plugs, Engine Hesitating/Surging/Fluttering

    Hi everybody. I'm new here but I've owned my '00 GTP for three and a half years now. It's my first car and overall it has given me a fair amount of issues but I still love it. Anyways I've modded my car from stock to safely run a 3.5 inch supercharger pulley. My knock retard numbers are under 3...
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