Originally Posted by Macca

Hi Jamie. Im watching this in anticipation :-).

Im going to write up my road review of the DMS headers on 991 GT3 shortly.

One thing I found interesting. When removing my OEM third muffler from stock headers the dealer found three of the studs (on the side of the muffler box) snapped.

For a few hours there everyone in the workshop was looking for the other 2-3 OEM centre mufflers they had taken off other 991 GT3 (for sharkwerks bypass) over the last 12 months. It looked like I could be in serious trouble as the fabrication shop they sent the muffler to to have repaired as a back up said it was not possible to replace the studs without cutting the muffler box open entirely!

A few hours later three used boxes were found - and guess what? Two of them also had broken studs! The thrid was a basically brand new unit taken off a car with 400 miles. Its the one they installed for me (no charge) but on closer inspection it too had a snapped studs - but the break was heigh enough that it still had all the thread they needed to bolt it on.

Jamie, have you come across this situation with clients? Obviously this is nothing to do with your product. My box was replaced with Sharkwerks at 2000 road miles then reinstalled in Feburay with the G engine and it saw another 4000 miles use including 6 track days - but the other boxes were all form cars that had seen much lower mileage (in one case only 400 miles!) and no track use!

Once the studs snap it seems there is no easy way to repair the box other than cut it open? To me this sounds like a flaw in the product design - essentially Porsche are giving us one use boxes!

The dealer claims they rarely remove the rear box on its own unless they do a bypass, with the engine swaps from PAG they unbolt at the CAT as the new engine comes with new headers and cat. They say its 100% likely removing the box will find snapped studs rendering the old box pretty much useless.

Id appreciate your view (or others) on this as I had not read about it and was not expecting it. Is there something I am missing here?

Luckily in the end I got my DMS installed with a basically brand new box but it was touch and go and the dealer now has 3 failed boxes in reserve (i.e. useless the y can be repaired).

Here is a picture of one of the snapped studs (other side has two snapped studs).

Originally Posted by Jon70

Jamie, I assume the megaphone version will be the loudest?

Originally Posted by Jamie@dundonmotorsports

When we've run them vs the stock tips, they're hard to tell if they're louder (we haven't measured them for dB...) But the sound they produce is "cleaner" than the stock tips, more pure flat 6, hard to describe. Had a set testing at an end of the season track day for us on our P.J.S' 997.1 RS 4.0L build and he didn't mention it being louder than what was on the car previously, but in theory it should be slightly louder...

sorry for the run around answer...