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Euro headers and cats are less raspy than the US exhaust, as I recall. It's been a long time since I installed mine.
A couple of things that make the car dramatically better to drive:
1) A tune. Either Epic (what I have), or Evolve. A lot of the around town drivability issues are due to crap throttle map calibration. Standard is a little soggy, Sport is undrivable. And they extra torque makes a HUGE difference.
2) A better shifter. Autosolutions is awesome once broken in. I'd probably do the 0% kit today. It wasn't available when I got my 20% kit.
If you're in the DC area, you're more than welcome to try mine out.
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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32
Hers:
1989 325iX
1996 911 Turbo
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