Willowbilly3
A *real* tin magnet
This isn't really a tech tip, more of an idea. I had a couple GM EFE flappers, you know, the thing right on the manifold dump that closes to force the exhaust through the crossover for warm up. I know they wouldn't totally seal but I was thinking they would make a cool cheap cutout. If you had them plumbed right they would just open everytime you went wfo and the vacuum signal dropped.