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I'm right at 95K and looking to replace the spark plugs, air filter and serpentine belt on my 99 STS. Can anyone recommend a specific plug for better performance? What's a good brand or serpentine belt to buy? I already did the fuel filter. Anything else I should look for? Kale

I have a 99 STS w/o Nav and I'm trying to find a suitable wire for turning on my sub amp. I have the schematics and found that I can splice into the power antenna module, but I can not find where this wire is routed in the vehicle. I can get to it in the headliner, and I know I can tap into it...

I decided I wanted a bit more growl from my exhaust so today I installed a couple of dynomax super turbo mufflers. They sound good, but they are a bit on the quiet side. I'd like them to be more throaty, but didn't want to sacrifice a quiet interior @ 70mph. I may be removing the resonator too...

To keep this forum active, here's an edit I did today: Kale

I just wanted to post this for the record... 245/40/20s on 20x8.5", 43mm offset, 5x115 wheels fit with absolutely no problems whatsoever. Lock to lock with no rubbing at all. The rear tire looks like it will touch if enough weight is added. The car has auto leveling so it shouldn't be an...

Is it possible to upgrade the brakes on earlier model Sevilles with the factory V gear? If so I wonder how much this upgrade would run??? I saw a CTS-V on display at Costco yesterday and was drolling over the V badged brakes stuffed inside the wheels. :) If not, what's a popular upgrade for...

Damn, I'm strugglin with this one....My Mark already has Enkei Kapones and they look wicked...Now my Caddy needs tires and I'm thinking it's time for a wheel upgrade as well. I found a guy with a set of them in the correct 5x115 bolt pattern with tires that I'm pretty sure I can get for around...

My car was imported from Canada, I'm guessing that's the reason for the ridiculous speed...I only drove one 99 Seville so I'm not sure if this is par for the course, or if it is because it is a Canadian car. Anyone know for sure??? Kale

Considering that there are obviously differences in quality, color, technology and hardware, what is the BEST kit for the 98-04 STS, and is it possible to "go wrong" with an HID kit? Also, I don't want to have to spend $500 to fix a burnt out lamp; that being the case, what are the options for...

After reading various posts and information about the Sylvania Silverstars, I decided to give em a try. I bought the high, low and fog lights as well. To sum it up in two words: not impressed.:( I didn't notice any improvement in light output. As a matter of fact, light output seems LESS...

Has anyone removed the trim around the windows and/or grill? I just got my windows tinted and want to black out my trim now..99STS.. Kale

Found this link today..Not much info but some cool pics of the upcoming STS-V. From what I've read, it's supposed to be around 380-400 HP and uses the Northstar as opposed to the CTS-Vs Corvette Powerplant. http://www.autoweek.com/files/specials/2005_detroit/cadillac/stsv/pages/1.htm...

I'm at the point where I need to either replace the stock 16" tires, or upgrade and go with a set of new wheels and tires. I want to know what is the biggest tire/wheel combo that will fit on my 99 STS. I'd like to run 22s but that may be pushing it. Realistically, I like to slap on a pair of...