Join Date: Apr 2010
Location: Grand Rapids, MI
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Having had a few more days driving around the Milan with the front & rear bars, they have definitely changed the character of the chassis response. Car feels more locked down with much less undamped "wallow", but it got a little dartier and little crashy - it was more of a comfy cruiser before. It feels to me like the suspension was tuned really well with the body shell, but now the loads and load paths have changed and it feels like the floorpan is not keeping up with the rest of the car. I can't say I felt this when I did the same mods to my 6 - it had already stiffer springs, Koni FSD shocks, and a stiffer rear anti-roll bar added when I did those though and was already feeling flexy through the body. The Koni FSD's digressive damping worked better the stiffer you made the body too, so it's a bit apples to oranges to directly compare. I'd have to drive it on some poor highway (ie I-96 between Lansing and Grand Rapids with its concrete wobble and ) to really suss out the details, but I'd definitely say I traded some comfort for a more direct driving experience. To contrast, my 6 got more comfortable and easier to control and read at the limit.
Anyway, food for thought. I'd change Dr's order to the following, skipping an upgraded front sway altogether (for traction and balance reasons):
1st: Rear floor cross bar (since you have a hatch)
2nd: Rear sway bar (probably wouldn't go any higher than Steeda's 22.5mm bar, unless you want to really change the handling balance and introduce some harshness)
3rd: Front H-brace or Ultra Racing front member brace
4th: Front shock tower brace
5th: Springs and shocks (or coilovers; regardless do at the same time along with any other control arm and busing changes).
6th: Autoexe 4 member brace set
and the super secret step:
7th: track down a used Steeda Fusion front subframe x-brace (should work on your '07, didn't on the '03-'05). Good luck!
Additionally I would get some thick anti-corrosion spray and spray down the underside after a good cleaning, both to keep the rust away and to reduce some noise. Also, just buy a bunch of Dynamat and start putting it everywhere under the carpet in the car - I'd definitely do this to my 6 if I still had it and it was my DD.
*SOLD* 2005 Mazda 6s Sedan Grand Touring ATX
Michelin Pilot Super Sport 225/45 R17 tires (Winter Bridgestone Blizzak WS-70 205/60R16); Racing Beat springs; Koni FSD dampers; Steeda 22.5mm rear sway bar; SURE RDS-06 Rear Brace Bar; Steeda Fusion Strut Tower Brace (w/harness carrier bend-mod
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2013 Cadillac ATS 3.6 Premium RWD 225/255 Pilot Super Sports, JacFab Ported Intake Manifold and Manifold Spacer.