I've got a 85GT with a modified 3.4. I've been working on the exhaust,changing it to a 3". I've also got an 88 engine cradle. I'm using a flowmaster Ypipe [2-2.25/3] and a modified flowmaster ball flange and mandrel bent 3" pipe. I'm wanting to use a flowmaster crossflow muffler with 3" in and 2-2.5" out 40 series. has anyone done this? Does the muffler need to be notched. I would think this would be big enough to support 300HP that's with 100HP shot of NOS. Any ideas or comments 85GT 3.4 Auto/3.06 14.9@90mph Lilchief
