The reason for a special exhaust for a turbo kit is that you need to have a as much of a free flowing system as possible.
Backpressure on a turbo'd car can be a bad thing. Wit as much air as the turbine is shoveling through the engine the subsiquent gasses need as much space as possible to escape.
Stock cars run about 6-8lbs of back pressure, slightly modded N/A car will have 3-5lbs and a turbo car will generally have 1-2.5lbs. Go with a minimum 2.75" dia. piping for the exhaust track and if you plan on going "mad boost" then 3" all the way is a must.
<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>Yes, but the turbo manifold itself creates the backpressure for the engine, backpressure after the turbine does you nothing. After the turbine you want as little backpressure as possible.<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>
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