exhaust and boost questions

kramer

Registered User
if i run my sc for awhile. when i shut it down i get a weird sound for the cats. (kinda sounds like rain hitting a tin roof)?right now there is four cats on it to pass emmessions. After that they are comming off. 2 are sc cats and 2 are ford lightning cats. just wondering if anyone else as had this problem, is it normal. i fear that they might be clogged? due to my other problem, when i get on the boost it pretty much pegs the gauge and cuts out. The check engine light comes on then goes off and it might stay on for a little while but if you shut the car off and restart the cel goes right off. could it be a clogged cat? plugs, wires, it doesn't seem to miss at idle nor under normal driving conditions only boost. spark blowout maybe? any ideas will help thanks
 
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