I have a lot more vibration in my car like I installed sub woofers not a new cat back exhaust. I am wondering if it's normal? I installed from the cat back a new straight pipe, s pipe, and that goes into a 3" pipe thats inplace of the muffler and splits the exhuast into dual tail pipes. Anyhow the car runs good, yeah it's loud. There is alot of vibration over stock is this OK or is something wrong? Thanks for any ideas or comments. This is what it looks like:

 

Loudness is one thing, but it shouldn't be vibrating any. Double check the installation, make sure the "over the axle" tubing isn't resting on the axle. Best bet would be to have someone monitor the exhaust behind engine load to pinpoint the area. You'll want to use ramps, not jack stands. Back the car up the ramps, apply the brake, give it "some" gas (don't get too crazy, and be very careful), and have someone inspect the area. It's more than likely due to a rushed install....

 

I put it on myself, I put in place one day and made fit adjustments the next and tightened. I have been back under it a couple time since to adjust and tighten. Its clear all the way around and hanging snugly from the rear hangers. The exhaust itself seems tight enough, its just the whole car seems to have this "base" vibration, just like from sub woofers, it's worse/better at certain rpms. I may have to go around the car every once and a while to tighten everything so it doesn't rattle.

 

I understand your depiction now. Unfortunately, that type of vibrating sensation is the byproduct of running a more open exhaust, such as the one you recently installed. Are you running a catalytic converter? Or just a straight pipe from the Y-Pipe itself.....?

 

I got the same thing going on right now. My whole car will vibrate a little at idle.

 

I am running the catalytic converter, glad I am or it might be way too loud. Will this vibration damage anything, or is it just likely to loosen things over time? Thanks

 

See now your throwing me off again....

Is this vibration literally rattling your teeth?

Can you post a small clip from inside the car, on either youtube or streetfire?