15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPSE Hack I believe it's called "Gundo"
Leading reported evidence
Use plugged hole
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
The PSE mod, also called Gundo hack which uses the plugged hole on a non-PSE muffler or you can do the partial muffler by-pass like Fister does.
Leading evidence: 'Use plugged hole' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use plugged hole' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T152433Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have an 03 996 and am looking to have the "Gundo" hack done rather than put in a new exhaust. What are people's opinions/experiences with this work? This is my daily to the tune of 12,000 miles per year, so I don't want crazy just an enhancement of the original Porsche howl we all love. Should I go 2 inch 3 4? How much have people paid to have it done?
This is also called the "Fister D" hack. Do a search for Gundo and Fister D on this site, and you will get lots of information! Worth doing. Good luck with it.
Also you have two options. The PSE mod, also called Gundo hack which uses the plugged hole on a non-PSE muffler or you can do the partial muffler by-pass like Fister does. The bypass mod is of course a little louder than the PSE mod.
Did mine last month. At tick over it sounds normal, then when you start to pull away it seems to growl and snarl, then as the revs get higher its wonderful.
Here's a link to mine, but you need to turn the bass up a bit to make if sound like it does in real life.
Porsche 996 X51 with Gundo Modification. - YouTube
The FisterD mod provides just enough growl at acceleration and snap when coming off throttle, but there is no drone at highway speed or around town. It's the best of both without being obnoxious. Well worth the investment!
My 997S 4.0 will have the Fisters paired with 200 cell cats and x51 headers underneath with a 82mm IPD competition plenum with a GT3 throttle body on the top side....can't wait for the car delivery in March!
Do it!! Just did mine fister style with 1.75 pipe between inlet and outlet...u could prob get away with 2 inch but any bigger might have clearance issue( from what I seen) sound is great
