Front and Rear sway bar for stock 2010 Mazda 3 S sport

[amati5]

Ok, further research clears me up with some info:

2.0 and 2.5 (3 and 3s) share same bars, f and r, 21mm/20mm. This is based on Mazda Parts - OEM Factory Replacement Mazda Parts | Jim Ellis Mazda. They have the same part numbers. For the Speed, it's call 2.3 with 26mm/25mm (based on Mazda site) and has different part numbers. I guess RB made bars for 2.5 and they said the bars will fit 2.0 but they aren't sure how they work with the 2.0 I think because of the less weight on the 2.0. (only about 125-175 lbs depends on the trans type). Last conver. with RB, didn't look like they will make the bars for 2.0.

So C Thur, when you said you " put a "2.5" rear bar on my "2.5" (2011 3s 20mm to 27mm) I honestly couldn't tell" what does that mean? Sounds like the same bar.

thanks

Edit: 2.0 and 2.5 have different part bumbers so I am not sure if they share the same bars. If they don't, I wonder what sizes are the bars for the 2.5

[c_thur]

It makes sense that the stock bars for the 2.0 and 2.5 would be the same for manufacturing purposes.

I was just musing that that 2.5 bar might have a more pronounced effect on that 2.0 than on the 2.5. I experienced a bigger difference putting a rear bar on my 2.0 sedan than I did on my 2.5 hatch. This could be caused by anything though- chassis stiffness, weight, etc.
The difference in the 3i Touring was huge. Lines were very different and it felt great even in lazy bends. The difference in the 2.5...I couldn't really tell. Maybe because I'd had a bar before? I dunno. More weight over the back? 3i suspension a bit softer than 3s? slightly different tire patch? sedan stiffer?

My 2.5 currently has the Racing Beat bar, so a bar designed for the 2.5 on the 2.5. If the Mazda part numbers are the same, a bar fitting the 2.5 should fit fine on the 2.0. The end-link holes will be the same and the after-market bar will usually come with the larger-diameter bushings and usually also clamps.