Engine/Transmission (1994 - 1998) Walker Muffler and Turbo Boost

[RWorth]

I installed the a Walker muffler with the 3" inlet and outlet. I don't have the model number but I believe it is the model that Joe D. used on his '97. Anyway when going down the highway around the 60mph to 65mph and adding more throttle as boost gets up to the 23psi and higher a have noticed a mid to high pitch drone noise. What I think I am hearing is the turbo pushing the exhaust through the muffler. I can let off of the throttle and the noise goes away due to the drop in boost. I was running straight exhaust and all I have done is add the muffler. Is there a science in which the muffler should be installed in a certain spot in the exhaust system? I put the muffler on to tone things down a little but this noise bothers me more than what the straight exhaust was.

 

[Joseph Donnelly]

I put the 21468 in stock location, didn't notice any drone. Moving it forward lowers the rpm band where drone occurs, generally. 21471 is the 4" Walker, btw.

 

[mechanic]

]

You might check that the brackets for the OE muffler are connected in the same place as the OE if possible. The weight of the muffler can cause a harmonic vibration if it is not firmly mounted.



I put a glass pack on mine first, and it had a bad droning noise at 1800 to 2200 RPM under load. I like the straight pipe sound better.

 

[pwerwagn]

I have a 3" walker on mine in the stock place and no drone at all.

 

[MDiPietro]

drone

Are you using a tail pipe? Put on my muffler one day, and the tail pipe the next. There was a drone without tail pipe.