First of all, I know zero about carbs...my motto was that I always wanted to know a good carb guy, but never wanted to be one...except my carb guy retired and moved to the lake, so here I am. I put triple mik 44's on my stock 72 240z for show purposes. And it worked, I was in six shows and got six first places. Mission accomplished. But I gave up the fun of driving, in order to have a car that looked and sounded pretty sweet. I'm now going to remove the Mik's and put "something" else on. Don't know what the something is. I see a lot of posts about Z-Therapy, but I also see these Weber's on Zcar parts: http://www.thezstore.com/page/TZS/CTGY/PFFC02 What's the diff between the two? I still would like something that shows well, but I'm tired of not having the fun driver that I once had. So goal #1...performance ahead of fuel mileage, goal #2 is to have it look good.