|
|
|
|
| Author |
|
|
Registered
Join Date: Jul 2015
Location: Seattle, WA
Posts: 421
|
Cat bypass pipe vs gutted cat
A PO of my '82 apparently gutted tha catylitic converter. I'm guessing that functionally this has the same effect as using a bypass pipe. I'm fine with that because there's no smog testing sheer I live. But is the sound any different?
|
||
05-13-2016, 04:53 PM
|
|
|
Member 911 Anonymous
|
Yes, the exhaust will be a bit louder not much but compared to a stock car
__________________
'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
||
|
05-13-2016, 04:59 PM
|
|
|
Registered
Join Date: Jul 2015
Location: Seattle, WA
Posts: 421
|
Yes, but do you think there's s difference between using a gutted cat and a straight bypass pipe?
|
||
|
05-13-2016, 05:08 PM
|
|
|
Cars Ruined My Life
Join Date: Feb 2013
Location: Right in your face
Posts: 1,881
|
six of one half a dozen of other
|
||
|
05-13-2016, 05:12 PM
|
|
|
Member 911 Anonymous
|
What I noticed is the straight pipe is more raspy. My MK Euro Muff had a bit more bass.
I now have the OEM Euro Muffler, it is definitely quieter than the MK but I also have cut out air box cover so I have intake noise too.
__________________
'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
||
|
05-13-2016, 09:05 PM
|
|
|
Registered User
Join Date: Jun 2015
Location: Irvine & Saudi
Posts: 96
|
Just removed my cat and I welded in my own straight through pipe. To be honest, for the average person, there isn't really any sound difference. If you focus a bit, you can notice it's a tad bit louder at the high rev range. otherwise just remove the cat, you want your engine to breathe.
__________________
A Targa. |
||
|
05-14-2016, 10:35 AM
|
|
|
|
Registered
|
In a different car, I gutted the cat's rather than replace as there were 4 cats and 2 weren't needed. I didn't like the sound so I ended up replacing them.
Point being, the sound will vary between a gutted cat and other pipe options. gutted cat on a 911 may be just fine.
__________________
'86.5 Porsche 928S '87 Porsche 3.2 Cab '12 Jaguar XJ '14 Mercedes GL550 '16 Mercedes C300 |
||
|
05-14-2016, 01:08 PM
|
|
|
Senior Member
Join Date: Nov 2000
Location: Great NorthWest
Posts: 3,950
|
I'd always advise removing the cat. and running the straight pipe. You will never remove all of the honeycombing as I understand it and a straight pipe is a cheap and simple solution. Now you don't have this option obviously but an SC cat in good nick is worth something up until all our cars are sunsetted from testing.
__________________
'78 Targa in Minerva Blue |
||
|
05-14-2016, 01:19 PM
|
|
Marble Grey
3.2 Carrera Cab
