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Do you have a link to them? I've never heard of them.
ANY longtube header with decent construction will perform similarly to any other header though. The key differences are in primary length...the longer the primaries, generally the more torque you'll produce under the curve.
I had them on my C5, seemed to be good, especially for the price. Never put the car on a dyno but was running similar 1/4 mile times to equally modded vettes. Mine were jet hot coated and looked as good the day I sold the car as the day I had them installed, which was roughly 8 years.
I remember them from back in 2000/2001 in the C5 era, they were like the header to have at one point, but didn't know they even made them for the C6.
I had them and liked the fit on my C5. It was a good cheap design that used good clamps and were a breeze to get the 'test pipes' in and out in 20 minutes. None of today's header choices make a swap in/out of cats possible without an X-pipe swap. Even then, you have to buy the second x-pipe and its going to take quite a bit more effort to get them swapped.
TPIS headers were the first mod and the first time I wrenched on a corvette.
I had them on my C5, seemed to be good, especially for the price. Never put the car on a dyno but was running similar 1/4 mile times to equally modded vettes. Mine were jet hot coated and looked as good the day I sold the car as the day I had them installed, which was roughly 8 years.
I also had them on my C5. The car was an A4 with 3:42 gears.
I installed them at the same time in combination with a set of 1.8 ratio Comp rocker arms and the car really woke up. Especially in 2nd and 3rd gear. Never tuned or dyno'd the car but it felt like I picked up at least 25hp. The LS1 like the changes.