If its a pipe vibration (not due to sound vibration) you have a different issue. If its that head thudding noise vibration in the cabin (resonance), then you want a 28 pipe coming off the pipe between your rear mufflers and tips.
1. First, use a hole saw to cut out a 2" to 2.25" opening on the pipe between your muffler and tips on each side (one hole per side of the car, hole should face towards the other pipe so the resonator you are welding on will extend into the area where the OEM muffler sat).
2. Next, have the exhaust shop weld a permanent cap (to seal one end of the pipe) on two pieces of 28" long, 2.25" pipes. Basically you want two 28" pipes, each has one open side and one capped side which reflect sound inside the pipe back at the open side.
3. Next, weld each straight piece of 28" to the area of the pipe that you cut the hole out of. You are basically t'ing off the stock exhaust with a 28" piece of pipe at a 90 degree angle, per side. This lets the sound go down that pipe and back and cancels out that annoying droning frequency.
4. End results should be that you have tee'd off of both side with a 28" capped extension pipe, each extension going up into the area where the OEM muffler sat.
Check my pics and this should all make better sense.
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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