I'm looking at replacing my STI with my dad's 02 E55. This particular E55 feels abnormally healthy-to the tune of 20-40 extra horses as measured by my Highly Calibrated, Extremely Sensitive Posterior Dynamometer ()-compared to other NA 55s I've driven, but I'd like more out of it. I've given a few E39 M5 owners a hell of a shock at stoplights with the STI, and I'd like to at least equal that performance with the AMG. Stock it's close but not quite there.

It also gives up some handling capability to a stock STI (it's kinda hard not to, it weighs about 600lbs more than the Subaru) and I'd like to mitigate some of that, too. Motor Trend's road test of a 2000 resulted in a 0-60 time of 4.8s, a 1/4 time of 13.3 @ 107, 0.85gs around their skidpad and about 66mph through their slalom. I'd like to take it more to <=4.5 seconds to 60, somewhere in the 12s at >=110 in the 1/4 and 0.95+ around the skidpad with a slalom speed north of 70mph.

With all that in mind, I've been researching my options for a while, but I'm having a hard time finding any real concrete numbers. What I'm hoping to do (depending on how much money I make off selling the STI) is throw the Kleemann headers and flash at it, along with a resonator delete/x-pipe and either straight pipe it or go with a high flow muffler of some kind, and slap on either a set of KW coilovers or H&R springs with Koni FSD dampers, the larger H&R anti-roll bars, possibly polyurethane front lower control arm bushings, and Dunlop Direzza D1 Sport * Specs on rims that don't weigh as much as the AMG Monoblocks do. Do you guys think that would be sufficient to get the car to where I'd like it to be?

Also, does anyone have any idea how much more power I'd see by putting the Kleemann cams on it in addition to everything else? I'm trying to avoid their supercharger kit because a. it adds a bunch of weight to the front of the car, which will hurt handling, b., it costs about as much as everything else combined, and c., I don't like blower whine. So yeah... I'd like to do everything else before resorting to that.

Is there anyone doing custom dyno tunes for these cars now, or is the Kleemann flash (which appears to just be a one-size-fits-all thing) my only option? And lastly, can I cram anything wider than 255 fronts/275 rears on this thing? It doesn't look like there's much room in there for anything wider...

Thanks.

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-Kevin
Past: '67 250SE, '86 & '87 560SELs
Projects: '73 Buick Riviera, '75 350SE (grey market, stick shift)
Cars that actually run under their own power:'87 300D Turbo, '03 Corvette Z06, '07 Subaru Impreza WRX STI Limited