Today was a nice day, so I brought my car to work. I had to run errands at work and on the way back, I took a long winding, super twisty stretch. It was like the fates conspired for me, it was essentially empty, and other than the lower temps and some residual moisture, it was nigh on perfect conditions to play.

It's also very rough with lots of elevation changes. Sorta like a micro-slice of Nürburgring. Well, the car felt good overall, lots of grip, and I knew I wasn't even straining the limits (too tight to push TOO hard, and it is a public road afterall).

But that brings me to the point of this post. At times it felt a little disconerting. There was a wobble, or jiggle in the tail end and a slight feeling of the car wanting to have a mind of it's own.

I know that 275s can induce trammelling, but this seemed different, and it's not really rutted, just bumpy and rough in places (but not everywhere). So I don't think it's trammeling.

I have 4/3 Koni's (lower perch in front, heater-hose mod in back, stock springs and sways all around) set to 4 sweeps from full stiff in front, and full soft in back. I also have SLP SFCs welded in, an SLP STB, and a UMI rod-ended PHB.

I got the SLP parts from SLP about 3 years ago, and the rest from Sam in August of 05. Around November I swapped out the stock tires for some BFG g-force Sports in the stock WS6 size.

I bought them because the ride, with the Koni's, got stiffer and harsher and started rattling things loose inside (which I hadn't had before), and according to TireRack.com those BFGs had more grip AND better ride than the stock GYs (pluse the stock tires were about 4 years old at that point too - non-garage kept, but only weekend/warm weather driven (no garage at the time)).

I installed the STB, dampers, and PHB myself. I've checked and re-checked the instal a dozen times trying to chase down a clunk over hard bumps in the rear. Everything is tightened to spec (everything that I had to remove to perform the installs at least). (and I followed the Install University guides and those found here as well)

My first thought was that it was the road surface. So when I got out to the highway, at about 80, I shook the wheel a little (to "rock the boat", as it were), and I felt it. So I got to thinking about my parts. As I've said, I'm certain they are tight, and I've felt this before too, it's just been awhile since I've driven it.

So then I thought maybe it was the tires.... A few days ago when it was about 50, I took it out to put some charge in the battery and aired up the tires to about 34f/30r, today it was warmer.

Still, I was hoping for the input from this forum. Any thoughts about what that feeling might be caused by? Or how to fix it? Anything I should look for? Any more detail needed? (and has anyone else noticed something like this?)

Sorry if it was long and rambling, but I was trying to put all the relevant info I could think of in.