I paid $100 with exchange of my old battery.

What were the specs you found enticing?

Could be wrong, but a few people found it still cranks perfect after storing for months compared to other generic battires.

I don't have a sound system setup but I do have a double din Kenwood Navi so I think it drains more battery then OEM.

Quote from another thread, "They are very vibration resistant and the are SEALED (no acid anywhere) and they do not "off gas" any dangerous Hydrogen that can cause explosions."

I don't expect any explosions lol..... but seems a few g35ers reco'd the Optima so I just went with it, most reco's on this forum have been spot on.

... and it's 5lbs lighter.

+1 Optima YELLOW top if you an aftermarket radio setup, if its jsut stock grab anything, interstate on hwy 50 will sell u rebuilts for 45$

Costco's Kirkland branded batteries are made by Johnson controls which manufacturers majority of the OEM batteries. It costs 75 bucks and comes with 3 year warranty. So if you are not fancy about weight reduction in your battery (how about losing 5 pounds instead? ;p jk ) I highly recommend Costco because you will be paying double the price at dealers for pretty much the same battery. Optima red definitely is made better and has cool factor tho...

anybody have a red top they dont need?

Bought an Optima "Red top" for mine about three years ago, lasted less than a year. Never again. Bought a Walmart special this time, no problems at all.