Rattle, Vibrate at 2100 RPM

[kchummer]

yes, mine did it too shortly after magnaflow was installed....crawl under H2 about parallel to passenger side door, and right there where the two (exhaust) pipes connect is a metal band that needs tightened....use a 14mm socket (if I remember correctly) and tighten it down.....it will stop the annoying sound that is coming from the connection...when motor is cold and metal band is loose it causes this vibration at certain rpms (like at a take off), but once the pipes warm up it disappears...just tighten this clamp and it goes away!

[AK47]

Well nice to see your reply ,,I had dreams of transfer box ,,,or transmission it was a strange sound ,,but then I kicked myself thinking how could it be these items as the car is in park and yes when it heats up it goes away ,,,again thanks for the swift reply

[AK47]

Well got it up on the ramp again and checked the bolts ,,,but we found what it was ,,the cat was the problem so we took he front section cut open the cat and seen that the brick inside was broken hence the noise and what a noise ,,so we took out the cat and placed back the piece we cut open and welded it up ,,mounted all back and it runs better than before ....