sammysquid said:
Isn't the S3 for the small cars? wouldn't you need a S4 or S5?
They do give you a little more power as you go up the range (about 10% per level), but the S3/4/5 numbering are really about many years warranty you're getting - i.e. the S3 has a 3 year warranty , 4 years on S4, 5 on S5.
What's more important is getting the right model for your car, as the 027 S5 is a 63ah/610cca battery, whereas the 096 S5 is a 77ah/780cca battery (OE spec is 70/700 IIRC).
The closest Bosch to OE spec is the 096 S3 which is about 20% cheaper than the S5 - but of course only comes with a 3 year (vs 5 year) warranty.