Slant 6 Turbo 68Dart Project

Yeah, downpipe (and exhaust in general) restrictions are one way they used to limit boost on old OE turbo setups.

Also, hate to sound like a broken record, but reading maps is SO important! Like, sizing the turbo is the most vital part of a build! Since you know what your 'new' one came off of, a map should be a little easier to find. Digging is in order!

Also, a little help: http://www.lovehorsepower.com/jooml...alculator&catid=8:mr2-helpful-stuff&Itemid=49

What you'd want is 3.7, 70%, 10, 4000, and 500.
This here is step 2: http://www.lovehorsepower.com/joomla/index.php?option=com_content&view=article&id=4&Itemid=48
The whole site is really purdy neat.

Second: That's crazy that it had no specs. And please take no offense to this at all, but I wish you would have asked someone. While I personally don't approve of eBay forced induction parts that move, most of them that I have stumbled across have specs of sorts (never a map, but still measurements) Have a page still of the auction? Maybe you missed something?

The downpipe may show some improvement. If your downpipe is 3-2.5 though, I'm pretty sure you can rule that out as so much of a restriction that you can't build boost. In fact, that's probably more than enough for what you want.