If you go single, you can't use the intakes they are selling so that'll save you a couple hundred bucks
. Buy an exhaust and Power FC used for the best price. The rx7store and rx7.com are great. However, I personally would buy it from rx7.com. I've spent q good chunk of money with both vendors over the years. Rx7store often takes a while to ship things(not necessarily an issue if you know up front). Jason at the RX7store does a really good job, but I like Ari at rx7.com more. He is absolutely great when it comes to tech support.