Did the old school conversion following the Up Fixin' der Porsche vol. IV article from an old Panorama.
First I started with a rough mockup to see if I would even like two out. Also moved the tubes around to see if I wanted GT3, rally or other spacing.
I thought it would be cool to center them perfectly under the license plate so that, If I wanted, I could put the original US bumperettes back on and the tips would clear them.
Here's my original muffler. It's a 2 in with an EGR bung. I had the hole welded shut when I did the rest of the mods.
The original one out hole with new flat cap welded on.
Showing the internal mods. Essentially two cut holes. The left side becomes a nearly direct pass through.
I had short tips put on because I had always planned to put the original Porsche black stock tips on. They proved too difficult to size and affix.
I ended up buying these fleabay 904 style cookie cutter tips.
I also had to reweld the right exit. The Up Fixin' article doesn't give exact measurements. The odd thing is, the dual outs don't seem to be centered on the muffler itself. The right out is closer, to the mount strap. Since I had the muffler off the car when I did the original mod, the dual outs were not centered exactly and it drove me crazy. After I had it fixed, I covered in high temp bbq white.
[img]http://forums.pelicanparts.com/uploads26/whi****ff1517667086.jpg[/img]
It drones at 2k but "Seat of the pants" dyno on my custom 2 out is a huge improvement. I bought a motorcycle baffle for the left out as it was more direct and I felt an immediate nerf of the power. So I took it out.
The sound is really really fun. A downshift to 4th on the freeway for a hard pull and shift back to 5th is glorious. Tunnels are my favorite.
The downside is being a dude with loud exhaust. The upside is really hearing every gear change and rpm.
I also have a one out Bursch muffler and seat of the pants dyno blows it away. Whenever I mount the Bursch, I miss hearing the car.
