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Originally Posted by 907rs
Until there is a definitive head to head comparison by a third party, I say you're on your own.
As of yet, I've only seen performance/road tests published for a couple of manufacturers.
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Well we will be putting the 21st Century deal though the paces.. It came in the other day and it is one well made piece.. I will snap some pics.
As for the headers.. on the non lowered frame I don't see why you couldn't run your own headers or have some made. But they are NICE headers, stepped and equal length with nice collectors..
A head to head comparisson would never work unless it was done with the same car the same driver and the same everything cept the sub.. Not exactly an easy task to do (swapping frames at the track).. so many variables.
The best way is to outfit a car and run it though the cones..
And there is NOTHING wrong with a well done stock subframe..