Attn: 993 owners- Make your mufflers LPMM's today!

Leland Pate · 11:07 AM

I've posted this on the Rennlist 993 board, but figured my fellow PP-heads would enjoy it too.
There are a bazillion muffler combos available to the 993 owner. But, most of them require the owner to part with the better part of $1,000 bucks or so.
Driven by shear cheapness and backed by years of frankenmuffler experience, I decided to pave into the unknown... I decided to create my own sport muffler.

It seemed there were a couple of options as far as how to modify the guts of the mufflers. In the end, I decided it was worth a try to create a by-pass pipe between the inlet and outlets. $7.50 in galvanized pipe from Ace Hardware and off I went.

All in all, I am very happy with the result. The car has that throaty growl that I have wanted so badly. At idle, you can just barely tell something is different. It burbles and has a more pronounced throatiness to it. When you get on the gas it really comes alive. Not in a drastic way; I don't think it is anywhere near as loud as supercups, but man it sounds good.

This was very easy to do. I bought two feet of 1 1/2" pipe, eyeballed it and started cutting the ends to match the inlet and outlet pipes. This was the most tedious part as it was a lot of trial and error before I got an acceptable fit. Once that was done I marked the pipes and cut the holes. Then the bypass pipe was welded together and painted with silver hi-temp to try and protect the weld (I ain't no fancy stainless Tig welder, just yet). Speaking of welds, you all can make fun of my poor beads, but I couldn't care less. I didn't do this for the bling factor and I know my skills lack finesse. Only other thing that had to be modified was the heat shield. You can see I made a cutout for it to fit around the new bypass pipe.

This would have been much easier if I had the proper tools (plasma cutter). As it was, I had to slowly use my cutoff tool with an air compressor that can hardly keep up. But I managed.

Not pretty, but this was just a beta.

A short video of my mufflers can be seen here:

http://manmicro.com/porsche/muffler/new_mufflers.MOV

Clive, another Rennlister, 993 owner and LPMM backer had a local weld shop fab up some better SS bypass pipes and he used 2" tubing instead of the 1.5" I used.

Clive put together a LPMM movie and can be seen here... I star in it... well, sorta...

http://www.manmicro.com/porsche/muffler/bypass.wmv

Anyway, this is a great modification and every 993 owner deserves a pair.

Are these great cars or what?!

Leland Pate · 08-03-2005, 11:09 PM

Have I been banned or something? Why aren't pics loading tonight?

k9handler · 08-04-2005, 12:54 AM

hmmm if I only had mufflers. ;o)

MIK911 · 08-04-2005, 04:40 AM

Strong work!

Is this mod similar to the RSR muffler (robin sun's)) in structure and/or sound? How's it sound compared to factory 'motor sound pkg'?
Post a sound cip!!

mike

911nut · 911nut's Garage

Lee, haven't the SCWDP bounty hunters caught up with you yet? There's a contract out on you for defecting .

Leland Pate · 11:08 AM

Mike, there are two sound/video clips in the post above.
I'm going to try uploading a photo again.

From what I understand, the motorsound mufflers use a 3/4" internal bypass pipe instead of the 1/2" pipe found in standard mufflers. We are installing 1.5" and 2" external bypass pipes in conjunction with the internal pipes.

Let's try another photo...

Leland Pate · 08-04-2005, 11:04 AM

Well, now I know why we keep Techweenie around... man, how did you know to change the script to upload5???

1998993C2S · 1998993C2S's Garage

Herr Leland Pate -
A big-ole Danke Schoen for being the DIY muffler modification "mastermind" LPMM. .. It was back in the days of Porschelist... IIRC it was Viken who suggested I try your DIY, the LPMM. .. It's a great owner DIY.

- Cheers,
'98 Carrera S
Ordered new -