Modified exhaust valve

I have thought about buying it previously. It says that it's modified but down the bottom it says that it's just an original exhaust valve from the later model. Is the later model known to make more linear power? I've never heard anyone mention that before.
 
Check my thread on this same page, modifying the old ones by hand does a good job, the exit side on this valve still looks restrictive, it's a good mod nonetheless!
 
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