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Discussion Starter #1
Okay, so my 2004 V6 Mustang has 2003 Mustang GT dual exhaust ran through straight (true dual) pipes...I used to have high flow cats, but they where busted & rattling like crazy. I got rid of the cats and just welded pipe in place as a temporary solution. The rattle was non-existant for probably a month and now it's back!! NO cats! Exhaust rattle! All fasteners/bolts are tight and nothing is rubbing anything! What could it be? The rattle only really occurs from 1700-2100 RPM and is especially HORRIBLE sounding at 2000 RPM (louder rattle) The rattle seems to be worst when I let off the gas, say, to shift, or just to slow down...any ideas?

Earl
 

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make sure the pipes arent touching anything, and if you can have someone rev it up to 2k or so and see if there is any movement that causes contact.
 

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Discussion Starter #4
Non-stock parts + no cats = NO warrenty coverage....plus my warrenty expires in a week. (milage) That and I don't trust dealerships and I think warrentee's are largely a joke...my pass side fenderwell splash shield decided to self destruct and screw up my fender...dealer said it was my fault :rolleyes: the one time I really needed it, they didn't come through for me.
 

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ah, well that explains it then :)

i had rattling coming from underneath my car at around 50mph about a year ago, i was worried my driveshaft was warped or a joint was going. turns out i had snagged somethign and bend some kind of brace/support thing right underneath where the d/s hump is in the backseat. about 20 minutes and a pair of vicegrips fixed it right up :gapteeth: redneck style :)
 
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