carrera79

noone has apicture of the inside mods out there ?
would be very interesting
fred

Ritter v4.0

What about performance- how does this seem to affect?
At the least I would hope it would do no harm.
Real dyno?
Butt dyno?

va122

Anyone know if this will work on a 996, the GT3 specifically??

Leland Pate

I don't know... but if I could afford a GT3, I wouldn't be looking to hack up a set of stock pipes.



If you have an inlet and outlet pipe that run sort of parallel'ish you should be able to create a by-pass pipe.

However, the term "LPMM" is Trademarked and strictly exempts the waterpumpers from laying claim on the name.

Ok, I made that part up, but it should still work.

va122

I guess I deserve the price comment.

I was curious b/c my friend's GT3 has 2 of the 3 baffles removed from his mufflers and it's loud as hell. Too loud for certain sound limits at events.

Likewise muffler bypass pipes, but I love the pops and burbles and thought this might be the best of both worlds.

Hey you air cooled guys thought of everything first, I'd be stupid not to take advice from you.

V

rkass

Leland, would this work with fabspeed maxflows (can't remember if there are two parallel pips on their mufflers)? Tx RK

Duane993

I had the same thing done internally with a stainless welder. But it cost $250 so you have the more cost effective solution.

black ice

Hey Duane, so would you think the internal job is about the same (in terms of volume) as the external? I'm interested in doing it but would prefer to waste the time doing it inside to preserve stock look (even if you can't see it). Also - did you use 2" pipes across?

Dave

Beretta

This is where I'm going..

My mufflers, so far, is opened and welded with straight pipes inside.

The resault not so much different from stock muffler.

Will add the LPMM and hopefully post a video.

Caveman

This is a blast from the past!

I still find most of the volume increase comes from using sport cats. That has been my experience.

Phil

wow.........this is an old thread........good to see that people can still do a search...........

TMc993

I did the LPMM on my car several years ago. As mentioned, the key to an "even" sound is carefully matching the shape of the openings you cut in the inlet and outlet pipes to the size/shape of the crosspipes. You will notice an increase in volume.

Beretta

So what you meen is it's important to do the hole size in the mufflers so close the pipesize you are welding as close as you can?


(My english is not the best, that's why I'm asking..)

Cortellazzi

Wow just finished the mod! I could not ask for more, i was looking for a little more sound , not much. Now i have this super burble at idle and amazing rasp at 4000 rpm. Thank you so much Leland , too bad winter is here soon!

Beretta

Going to start today. What is the best way to make the bypass tube fit to the exhaust pipes?

Not easy to draw a circular line, when the object is round to.

I would like to fit them as good as possible before I weld it.