been on for about a year now. You'll lke em buddy. They still look good, not polished/chrome looking, they are blueish and amber like colored but still look good. No leaks. I used the hardware that came with em and the block side gaskets. Everyone says to ditch both, I did not. They bolted right in place and saved me alot of money. The cheap black painted ones from summit are almost the same price.
I had a thread on here about em, in the exhaust section I think, just have to search.
ONLY downside, tight to get to the plugs, I used an offset 5/8 wrench, and open end and box end 58 along with a socket and ratchet on some. Basically the last 2 on each side were the tight ones to get to. I could get them pretty good, but short strokes, like 1/8 or 1/4 turn at a time.
As for a difference, eh not really. Maybe but I'm not sure, I had leaking manifolds, bad donut gaskets and cracked, not to mention they were warped too.
You'll have to get your egr removed from the computer or else it'll throw the light on with it being gone, plus the egr plate for the intake.
