Anybody familiar with these? I am debating whether to install a new one on my K20 acura autocross engine or just go with the stock metal ones....? Looks like the folks who have used them have differing opinions of their value.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Hey T,I looked up info on the subject.From what I read it does not make that much difference.The bolts transfer the heat too.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

The only cars I have seen them make a difference on were cars where it dramatically increased the size of the plenum. Like on a Nissan VQ35. I would think adding 1/2" to the runners on a K20 manifold isn't going to amount to much.

However, after watching you drill several hundred holes into a brake rotor chasing ounces of weight reduction, the fractional amount of power the spacers may add, may be worth it in your application given it is a true race car.

In say an RSX at full weight the difference is probably entirely negligible. But in your case, maybe you would see the difference.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i

I have seen that gasket in person and also seen it installed, the manifold was still hot.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

I went ahead and installed a new plastic one on recommendation of my favorite machinist.

Since the fuel injection is all set up using it I decided not to change that element and risk throwing something off.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.