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I was browsing around HDK Autosport's site today and noticed something very nice about their headers (4-1 and 4-2-1).

<img src="http://hdkautosport.com/Merchant2/graphics/00000001/manifold-41-best.jpg" border=0> <img src="http://hdkautosport.com/Merchant2/graphics/00000001/manifold-421-best.jpg" border=0>

If you look at the runners going to the collection chamber are the same length. This is exactly what you want in an exhaust manifold. This will help to optimize your power gains.

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I drive a slow car.
0 to 60 in 11 seconds (look out!)
 
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