Muffler bypass or catback system?

[tommy583]

Internal muffler bypass sounds better than a $200 cat back in my opinion. I've tried both. Plus the bypass looks stock and is cheaper.

[Finnegan]

Does anyone have a link to a diagram for the internal muffler bypass mod? I'd like to take something to show the muffler shop and see if they can do this.

[particlewave]

Originally Posted by Finnegan

Does anyone have a link to a diagram for the internal muffler bypass mod? I'd like to take something to show the muffler shop and see if they can do this.

Some info and pictures here:
http://986forum.com/forums/diy-project-guides/70112-internal-exhaust-mod.html

[Finnegan]

Yes, thank you! That was the thread I was thinking of. I'm going to take that write-up and pics to a muffler shop here and see what they can do.

PW, you said,
"Though I do love it, if I did it again, I'd do a third 1" hole on each inlet. I wouldn't mind just a tad bit more."

Would a slightly larger bit have the same effect? 1.5" all the way through?