Replace Cat with a tube-style muffler??

[ruby911]

I have seen many times the reference to a muffler by-pass, but it seems to me those get bolted to the back of a cat, test pipe, cat bypass, etc. Has anyone ever replaced the Cat with a cylindrical type muffler and then have the exhaust exit in the stock location (for a Carrera) - eliminating the need to have a muffler running behind/parallel to the rear bumper?

I have not see this anywhere (that I know of), but it seems like something someone would have tried by now.

just curious.....

[SCWDP911]

This is going to be a matter of trial and error for you most likely. Find some cheap cats that can be cut up for the flange and start experimenting.

A couple of guys on here have done it that I can remember. Both of the one's I remember did not care for the results. This is where it is purely a matter of preference. Good luck. Make sure to post result on the "The Ultimate Exhaust Sound Clip Thread" when you are playing with it.

[ruby911]

Hey Shane - I am not sure I am at the point of experimenting yet. I have a bypass going into the stock muffler that I am happy with......for now.

I was thinking that if I am 'bypassing' a Cat but still going to the stock muffler, why couldn't I just use the space that the cat (or cat bypass)sits in for a muffler and eliminate all of that extra piping and weight behind the bumper.

I have read I think almost every post on here about exhaust, but do not remember anyone going this route, so I am assuming it is a foregone conclusion that this is a bad idea - I just cant figure out why.

[Oh Haha]

That's funny because I was thinking about this setup when replying to another Pelican asking about exhaust.

Like Shane said, you will need to find a source for flanges be it from old cat. convertor or maybe even a muffler could make one or two.

I think any decent muffler shop could fab it up for you.

[IROC]

One Pelican I know did this, but skipped the muffler and just ran a straight piece of muffler pipe straight from the HX exit out the back of the car. The sound was glorious but very loud.

I think you're going to find that even a cylindrical sort of muffler in that spot isn't going to get you a lot of sound reduction. I'd love to hear it, though!

[Gogar]

[SCWDP911]

Originally Posted by ruby911

Hey Shane - I am not sure I am at the point of experimenting yet. I have a bypass going into the stock muffler that I am happy with......for now.

I was thinking that if I am 'bypassing' a Cat but still going to the stock muffler, why couldn't I just use the space that the cat (or cat bypass)sits in for a muffler and eliminate all of that extra piping and weight behind the bumper.

I have read I think almost every post on here about exhaust, but do not remember anyone going this route, so I am assuming it is a foregone conclusion that this is a bad idea - I just cant figure out why.

Someone used a shorty Thrush GP and said it was just way too loud, but that is what I was saying... it is a matter of personal preference that you may have to play with

[SCWDP911]

Originally Posted by Gogar

you need to get back on tour dude... you are clearly bored...

[doublestuff]

I tried exactly this setup with a 12" glasspack. IT'S TOO LOUD. I mean really, really loud. Not so much at idle, but at ANY revs it gets annoying pretty quickly. Sounded really cool, but way, way too loud. Did I mention how loud it was?

Here's a photo, I did like how clean it was as far as the plumbing is concerned.





I pulled it off and put the stock muffler back on, by the way.