My stock h-pipe used to rattle. It was the metal-cover that goes over the catalatyc converter. Get under the car and bang around on the h-pipe to find the rattle.
After I installed my offroad h-pipe I had a problem with the smog-pipe bouncing around on the h-pipe. I shortened the tube and used a rubber tube with some clamps to hold it in place better. Another option would be to wrap the pipe with heat-wrap.
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Eric - 89 Mustang LX coupe
5 speed 302-Cobra Intake-GT40p heads-TFS stage 1 cam-FRPP 1.6 roller rockers-3:73 gears-KYB shocks and struts-Eibach Pro-kit-HPM Mega-bite upper and lower control arms-FRPP aluminum driveshaft-16x8 Chrome Cobra Rs
R.H.C. #14
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