Is there a physical difference between a VAG 2.0 tdi CR 140 hp engine and a 2.0 tdi CR 170 hp engine? Or is it just the software that makes the difference? Do they use some different parts, or not? If the parts are not different, would a modified software (the so called chip tunning, remapping etc.) be acceptable in getting the 140 hp one to 170 hp too? Or it would require more extensive modifications? What is your opinion? Thank you.