Stock '99 502's with corsa silent choice.
Are the SM a direct bolt up for my silent choice valves, oil filter, electrical and shifter mounts? Any difference on the width of these over the stock cast iron manifolds? (No room to go wider) And finally, works fine with ECM as is?

Thanks

thanks.

(Couldn't get SM site to work past home page.)

I've researched them, Too Old has the best price !!

Mike

Might have lucked out???? Found antifreeze along the bottom of my stock manifolds other day, thinking they were cracked. Pulled the worse one off tonight to find the inside plastic pipe plugs are leaking. Risor gasket surface still looked fine, and no signs of water in the exhaust ports, so that buys me some time.