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Cat bypass on stock 3.2 muffler
Was planning to pick up a cat bypass for my '87, but was not sure if I would install a sport muffler or not. Can anyone comment on the sound level with a cat delete and stock muffler? Any louder? Rev better?
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Yes it runs
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That's my set up on an 87.
Slightly louder. Butt Dyno can't feel any difference. Heat level under the car is reduced. Removes a little weight. |
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Retired, finally
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I couldn't tell much difference when I changed the cat to a M&K pre-muffler, except it was a lot prettier.
Then I changed the stock muffler to a M&K sport 1 in 2 out. Wow.
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2009 Porsche Cayenne Turbo S; 2019 Corvette Grand Sport Coupe; 1998 Porsche Boxster; 1989 Toyota Supra ChumpCar; 1989 Alfa Romeo Spider; 1977 Porsche 911S Targa 3.2L"Bwunhilde II" chimera; 1970 Datsun 240Z 2.9L "dogZilla" project |
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a cat-delete pipe is different from a pre-muffler set up, say from M&K. the cat-delete pipes are simply straight pipe that produces a sound not as pleasing as the pre-muffler, no matter what you bolt on behind it. i'm only mentioning this because the OP mentioned a cat-delete pipe.
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'04 GT3 '97 C4S '90 C2 '86 951 |
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Brew Master
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I have a cat delete pipe and as far as I know the muffler is stock. It has a nice high end growl. I'm gutting a stock muffler to add to sound on the low end and probably make it growl a little more on the high end. The only problem that I have is a popping sound going up through the gears under heavy throttle. I'm working with a chip maker to sort it our. According to Steve Wong, the only way to fix the popping is to have a chip designed for your setup.
Hope this helps. |
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The PO had a bypass and an M&K muffler installed. I don't know what mine used to sound like but I have heard others, and I like the way mine sounds.
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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OCPO
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Quote:
Would love to hear your set up.
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2018 X5 86 911 Targa 3.2 80 Mercedes 450SL 2006 530xi BillyBoat/H&R's....gone |
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OCPO
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I have the M&K pre muffler with the stock muffler on my 86. The butt dyno says we are faster but nothing documented. Sound wise the car is actually a bit quieter then stock with the cat. At 2800Rpm there is a very nice low tone rumble that I love hearing.
My goal would be to raise the volume on the low tone rumble but have no good sound clips on mufflers out there. Ideally I'd like to got to the M&K 1 in 1 out but need to hear it before I pull that trigger .....
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2018 X5 86 911 Targa 3.2 80 Mercedes 450SL 2006 530xi BillyBoat/H&R's....gone |
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abides.
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+1 to this.
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Graham 1984 Carrera Targa |
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Sure, I'll get one and try to upload tomorrow.
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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As requested:
911 Porsche 3.2 muffler sound bite --> 911 Porsche 3.2 muffler sound bite - YouTube Apologies as this is my first youtube u/l. let me know if I should take from another angle. previewing on the phone sounded tinny. previewing on the net sounded too bassy. hth, Dan
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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OCPO
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Thats great. I'll listen to it about 50 more times. Thanks you for posting... Looks like I'm now closer to spending $625...
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2018 X5 86 911 Targa 3.2 80 Mercedes 450SL 2006 530xi BillyBoat/H&R's....gone |
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Thanks - I mentioned in a PM to you that the recording sounded a little saturated/clipped, but it is low sounding. My wife says she can hear me a block or 2 away, and I try to keep it to 25 mph in the 'hood.
I really bother to listen to the radio. It is not as wide open as the sound on the fabspeed site with their clip of a 3.2 cat and muffler bypass. (no affiliation) 5 years and no neighbor complaints. I will try another recording this weekend to see if I get one that is more faithful. Hopefully the OP can use this info too.
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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what did you use to record that sound clip? the sound isn't bad, but your exhaust sounds a bit tinnier/raspier than mine and i'm running the M&K bypass and M&K 'motorsport' 1in/1out. i really need to get a good sound clip of mine, but the device used and on what system the clip is listening to has such a bearing on the sound, you never know what it will sound like on the other end. mine is definitely a deeper, bassy sound - at least from what i hear of yours online and mine in person.
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'04 GT3 '97 C4S '90 C2 '86 951 |
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OCPO
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M&K cat bypass or M&K Pre Muffler? More clips are great...hope Brian knows your doing his work for him....
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M&K 'motorsport' muffler arrived today - not your ordinary 1 in/1 out as far as brian goes, if i'm happy with a company's product and customer service, i like to spread the 'good' word. i've been self-employed since i was 22 y/o and i know the value of good PR and referrals. good companies and owners should be promoted and the opposite should be exposed - imo. for the record, i paid full price for my muffler - so no ulterior motives on my part.
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'04 GT3 '97 C4S '90 C2 '86 951 |
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Quote:
I think the raspy sound was due to the recording - the bass sound may have overwhelmed the phone because I may have had it too close for the leetle mic to handle - the sheer awesomeness of the sound is too much for the phone (hi & low's get clipped or cutoff because the phone mic can't handle the range of frequencies).
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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OCPO
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I'm already a M&K customer as well. I'm running their Pre Muffler and SW chip and have been very happy with it them and the set up in general. This was my intermediate step before going to an all out sport muffler on my 86. I also agree that good co.'s should be promoted. Been happy with most vendors associated with our form just would like to get M&K to put these up on their website to sample...hint,hint. ![]()
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2018 X5 86 911 Targa 3.2 80 Mercedes 450SL 2006 530xi BillyBoat/H&R's....gone |
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OCPO
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This is not the stock M&K 1in1 out, it has been modified, (other than the tip@ 3") so it may not sound like steely's?
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Quote:
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'04 GT3 '97 C4S '90 C2 '86 951 |
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