No one has suggested it yet, but the most economical way to increase HP is to sell your present car and buy one with the turbo. I know everyone from turbobricks and the hotrodders will howl, but if you look at the problem objectively, it's hard to beat trading cars. If you have a '91 740 (for example) and you can get $1500 for it, tell me how you're going to come out better building your own when you can buy a nice 740 Tic for about $2500?
If you want to build a car, build a car. If you want cheap horsepower, trade up.
someguyfromMaryland
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