16 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHGundo Hack PSE Hack C4S
Leading reported evidence
Use 2.25" pipe
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
I used 2.25" pipe for my fister-like muffler modification.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
really, it really changes the sound, to a smoother, sporty idle (stock idle is so anemic), a lot more, than louder (but it is louder) and under WOT sounds raspy and sporty, as it should, like a, well, Porsche.
Leading evidence: 'Use 2.25" pipe' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace sound' (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.
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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
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Suggestion
really, it really changes the sound, to a smoother, sporty idle (stock idle is so anemic), a lot more, than louder (but it is louder) and under WOT sounds raspy and sporty, as it should, like a, well, Porsche.
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
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Replace sound
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
really, it really changes the sound, to a smoother, sporty idle (stock idle is so anemic), a lot more, than louder (but it is louder) and under WOT sounds raspy and sporty, as it should, like a, well, Porsche.
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.
16 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: 20261026T113718Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi Guys,
I'm just wondering if the 2" pipe or 1.5" pipe is better for this mod. I don't want it to sound too loud, but at the same time all the piping is 2" and would like to make the gundo hack 2" as well for equal air flow?
Would 1.5" have any restrictions?
I would like to hear from some people that did it... and if they like the mod?
Thanks,
Alin
My '02 C4S had a 1.5" Gundo hack on it when I bought it. It definitely sounds better than the stock exhaust (just a hair louder), but it wasn't enough for me, so I went with muffler bypass pipes, which were way too loud (actually, the exhaust note itself wasn't too loud, the drone in the car is what killed me), so then I went with the Fabspeed Maxflow cans, which I wish were just a hair louder, but they don't drone.
Long story short, I'd go with the 1.75" or 2" if I were to do it to my car.
I had a local shop do 1.5 piping. Personally wasn't loud enough.(this is with 200cells already in place).
I switched to fisterD's. He uses 1.75 piping. It's better. If I were to do it again, probably 2 inch.
If you don't want it too loud, I'd go with 1.75 or even 1.5
I used 2.25" pipe for my fister-like muffler modification. I got the pipe
here
, had a local shop cut it and weld it in. Sounds nice (
video
). Not too loud for me.
BTW, I did
this hack
as outlined in
this epic thread
.
I went for the 2.25 bypass (Blocked off muffler chamber to outlet), it is perfect, nice note on power but no way overbearing when you just want to drive on the highway. I had the same concerns as you but isnt that loud
Small shop in south Etobicoke called Tech Tune Exhaust, Kipling and Norseman,. Nice guys, think it was $350 for both. Took him some pictures and he even took pictures as he was completing the job. Hot Rod scotts wanted $700!!
Pull the cans yourself (very easy) and bring them to the cheapest muffler shop in the crappy part of town. Don't tell them they're off a Porsche and it'll only cost you a hundred bucks. :thumb up:
PS, Capt Obvious' car used to be mine and the hack he's referring to is the one I had done. I didn't think it droned (IMO), but he's right that the Fabspeed's sound much better. For the money, it's tough to argue with the hack.
Same here. Took mine off and had a local muffler shop do it with 2.25 SS for $150. Absolutely not too loud (I'm 54, so my age version of not too loud, not a 22 year old ricer version ;-) )
really, it really changes the sound, to a smoother, sporty idle (stock idle is so anemic), a lot more, than louder (but it is louder) and under WOT sounds raspy and sporty, as it should, like a, well, Porsche. Nice burble when you come off the throttle. Really, just perfect, for me. The grinniest $150 mod I've done. Cans are surprisingly heavy for their size, so I imagine lighter ones would be nice.
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