That's what my muffler guy said (he builds bracket racers). He said put new pipes on, run it up good and hot and put the H where the discolouration starts. I also noted that a X is even better. ----- Original Message ----- From: "Jan Harmonson" <jharmonson@xxxxxxxxxxxxxxxx> To: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Thursday, February 05, 2004 2:33 PM Subject: Re: IML: Two 75 Imperial Questions -- Vinyl Top Removal and Cam Profile Hi Has to do with the equalization of pressure...don't know technical answer but it sure works. Some guys say to put some paint on the pipes first, run the car, and then put the equalizer were it was hottest. Jan