Originally Posted by mdisav

Well I have been thinking for some time on how to do this since there is quite a bit of pipe before and after the cat to successfully hollow it out without putting in a straight pipe. My 87 was easy, I just took it apart and gutted it from the rear opening in the pipe.

So I took the front pipe off and used my makita cutting disc to cut a panel out in the side of the cat. I then gutted it quite easily and welded the panel back on.

It has made a noticeable difference in power. I bet the egts are down although I do not have any gauges on my 99 to give any numbers.

I also have the aggressive chip from speed tuning which is probably taking advantage of the modification.

I think it may be time for a G-Tech pro run. Before the modification I ran a 7.72s 0-60 with no power braking and the aggressive chip.

Now if I or someone can just come up for something for the egr...