I have problem with the down pipe leaking all the time,right at the turbo to down pipe connection,I have a TA49 and a 3 " bgc down pipe,I`ve used 86/87 GN donuts (they fit good,but look small),but after a few hundred miles,It starts leakin at the bottom,never gets tooo bad,but,just cant stand the phst,phst,phst,noise it makes.I`m sure sombody out there has been there done that,what do I use to stop the leakin and has a bigger hole in it.I was once told to use a dough nut from a 75/79 ford f900 w/ 477 or 541 gas motor,but ford doesnt list that part number I was given for that part,tooo old he said,,,anybody have any answers for me ???----------Jack