I installed my MAC LT's last weekend. Sounds great but there is a rattle I don't how to fix. After I lowered the engine and the collector is making contact with the front lower A-R bushing heat shield. At least on the passenger side. I was told the only way to fix this is to replace those bushings with something like Steeda's Front Lower A-R Rear bushing mount kit, Part #555-4008. And then the heat shield can be bent a little to remove the header from contacting it.

Has anyone run into this when doing any brand headers? I've never read about it before. I'm still using stock engine mounts. Steeda's price is like $215, which seems absurd.

Would this be something easily fixed in replacing the Kmember instead?