Originally Posted by JDWalton

seems kinda ****ty man, both my mom and I run those BBK and there fitment was perfect from day one. I wish you lived closer, I would give you a hand.

Can you make a video?

Also, the post said it sounds like its comming from behinde the dash. Can you pull your A-pillars off and go for a ride? The dash itself has been know to make some rattles, especialy with all you have done, this could be some of the sound. The normal rub spot is where the A pillars meet the dash. They just pop off. If pulling them fixes the issue then you just need to go to a pharmacy and pick up some mole skin to fix it.

How many miles on the car? Reason I ask is if your motor mounts are worn, that can create a situation where you get a buzz while driving that would be hard to find sitting on a lift. Consider new mounts or a CHE k member brace.

Lay down under the back of your car, I think mine was particaly noticeable on the driver side. Where the hanger is for the muffler (in your case the deletes) how much clearence is there between the rear most hanger and the body. If less then 1/2 inch, you need to bend the hanger or cut off some of the material sticking through it. This made a hell of a racket on mine for a long time, but only after the exhaust was hot, was a pain to find.

Look at where the flange from the header meats the flange from the X pipe. Mine and my moms BBKs sit real close to the frame, like I said before if your mounts are going and the headers are close enough, that can be your source. If it is, you should see the rub spot already where the protective paint is rubbed off and a nice shiny spot is on the frame rail.

Both BBK x pipes we had appear to had been pulled off there jig too fast when welded. That "toes in" the front where the headers sit and the x pipe is too narrow. you need to measure the distance between the openings of the headers and use a hydrualic jack to open up the distance between the openings on the front of the X pipe. If they didnt do this and just stretched it on, its possible that the flanges are tightened against the side load of the fitment, and not acutaly seated on the header.

There are two bolts on those headers that do not fit once the header is in place. They need to be run through the header, then the header slid in. If the shop is lazy, you may be missing bolts. Check and make sure all bolts are in.

Go buy yourself the appropiate sized ratcheting box end wrench for your header stud. I like the one with the swivel head.
for example:
http://cgi.ebay.com/GM-Goodwrench-7P...item2a086c61cb

after a few heat cylces they need to be re tightened. Then again after a few more. After the first couple times your retighten them, they should stay. But with all headers you should check preiodicaly.


Hope this info helps.

Originally Posted by hammeron

i hope you get this fixed smoker, we all know how annoying exhaust rattles can be.

i think JD listed at least 5 things that can be causing your rattle or vibration, it's one of the best posts i've seen in months.

Originally Posted by hammeron

i know you would be able to fix this if you could get the car up on 4 jack stands, but since that is not possible you've got to find a local muffler shop who can assist.