Spearco, Garrett (I.e. Precision turbo), greddy, hks, pwr are the ones that I would look at. For 700 I would go with a premade one like
Precision Turbo 750hp Front Mount INTERCOOLER FMIC : eBay Motors (item 300349477195 end time Feb-17-10 05:48:05 PST)
or you can buy 1 from cheapturbo.com for a sheet metal Garrett cored I/C.
The 50 mm is a good one. I have two on my setup. I wouldn't recommend it because it is difficult to get right. There is no adjustment you have to buy springs. I'd look for an adjustable like hks, greedy, turbosmart, procharger etc.
Precision Turbo 750hp Front Mount INTERCOOLER FMIC : eBay Motors (item 300349477195 end time Feb-17-10 05:48:05 PST)
or you can buy 1 from cheapturbo.com for a sheet metal Garrett cored I/C.
The 50 mm is a good one. I have two on my setup. I wouldn't recommend it because it is difficult to get right. There is no adjustment you have to buy springs. I'd look for an adjustable like hks, greedy, turbosmart, procharger etc.