There's too much war happening in this forum. Let's be constructive and informative. The Blitz kit looks very nicely engineered. I am sure this kit is made to operate within the limit of 2zz-ge engine and made to be easy to live with for its buyers. Also, AU$7000 is indeed some big spending, but maybe there is a reason behind this. We all experienced the so called "you do get what you paid for", and for the easiest example, and perhaps the most common item purchased for corolla, is cold air intake. Most of people here buys AEM, Injen or TRD rather than Ebay intake. I bet when it comes to the decision to buy is because of the brand's solid reputation. So far, in my experience, most big brand names does performed closer to what it promised compared to the lesser known brand. You just have to be very selective in which brand name you buy, and not for the sake just to be branded. Best of all, its bolt-on affair. Read the instructions carefully and install it twice as careful, and you should be ready to go without many dramas (there is always a drama when it comes to modifying). This is a great thing to most people, and these parts are much easier to allocate to buy. Don't forget warranty, thats a big deal (Although parts from overseas may not be valid for warranty). Other options you can go for, is go custom made like Xoom's turbo, and The_J_Factor celica with rotrex supercharger. Both seems to be performing exceptionally well, but of course this takes more time and effort, but can sometimes ended up spending less money to spend than buying branded names. Or, the otherwise. But hey, the parts used in this custom made kit is also branded name right? Why of course it is :) And of course quality craftmenship, which cost you top dollar. But if time is money, then the actual cost to build these kits are actually more than you spend. And perhaps that's why bolt on kit is expensive? Because the manufacturer spends a great deal of time (money) investing into a kit to be relased to market? You got to get your capital back in any business now do you? Of course.