I have them on mine. Love them and they still look great. And, I installed the engine with them mounted! Lots of clearance and great access to the plugs too

As far as performance goes, they seem to be great, though I haven't done a side by side comparison with long tubes or manifolds. I did read the comparison mentioned a while back and they fell right in between, maybe a little closer to the long tubes than the manifolds.

They clear the PS box, but just barely. I dimpled the driver's side one where it was close just in case.

The ease of installation and access to the plugs are infinitely better than manifolds and especially long tube headers of course. Whatever you may lose over the long tubes, I don't think would be very noticeable on a street car and the convenience benefits definitely outweigh any loss in my opinion. I will definitely use them again...