That is what I was trying to tell you earlier. pulse/reg. amps, are not the same and as near as important as CCA's. 338CCA is not nearly enough to crank over your engine, espically if you get cold weather. I'm sure your owners manual will tell you the CCA, if it's not listed on the Batt it's self. Most car now-a-days have at LEAST 550CCA.
To me it's not worth the sacarfices you will make or the problems you will encounter, to save weight with a batt. unless you are a pure race car. Look into some lightweight weels, cont. arms, carbon trunk lid, carbon rear doors, ect. Plus that is way too expensive for a batt. I say go OEM or equal. That way when you buy a batt from the dealer, you will get a no hassle, at least 48month warranty. And a lot of places offer a 84month warranty, I know that my work offers the 84month. Plus you can get free starting/charging/electrical tests done when you have the batt. replaced or when ever you want. Just make sure you mention that you bought the batt there and you think there is an issue with it and you have a warranty on it.