I recently performed a muffler delete on my 2004 touring, where i basically have a pipe 3 feet from the end of my car blowing exhaust into my cabin etc (its not bad unless I'm doing some very spirited driving). It sounds great and I'm not sure if i got some performance gains, but I'm sure it didn't hurt!

I was planning to buy my own exhaust piping and weld the exhaust tips from my muffler onto this new exhaust i wish to make. I've seen pics and vids of people making their own muffle bypass systems, but they honestly don't look too good. I want to design my own muffle bypass system on solidworks, using flow simulation and weld my exhaust accordingly.


That being said, are there any guides to muffler bypass DIY's that are on here or other sites? I've been having a lot of trouble finding good guides. And does anyone known the initial velocity of our exhaust gasses after the resonator?

Cliffs:

-Are there any good DIY muffler bypass guides you've ran across?
-How can i find the velocity of our exhaust gas after the resonator?

 

bump

 

There's no real special trick to it, you just want piping the same size as what you currently have or maybe a diffuser cone like the motordyne single track setup for optimum scavenging. Bring it back to the left side hanger, add a single support arm and you're done.

I made a simple flange and welded a 3" pipe elbow onto it to use as a muffler delete for the track, not for flow but to remove the 30lb muffler from the car. The outlet is not a restriction, and as long as you keep it pointed away from anything critical it will be just fine.

It also sounds very good on a stock exhaust if you still have the factory cats, a bit loud but not as bad as some cat-backs, and with a much better tone.

 

I have no direct knowledge of either a DIY bypass info or how to determine the velocity of exhaust gas after the resonator. But despite what you think you know, unless you retune the VQ to take advantage of the greater flow and less backpressure, you're just foolin' yourself.