Cat Bypass Exhaust...
02-12-2005, 08:49 AM
#16
Instructor
Originally Posted by Pesty
This i sprobably a stupid question but do you need to have the car remapped/chiped if you bypass the cat?
Just found out I will be getting a small bonus £200 ish so I need to spend it before the misses finds out
ps wheres the best place to buy a cat bypass
Just found out I will be getting a small bonus £200 ish so I need to spend it before the misses finds out
ps wheres the best place to buy a cat bypass
Anyway I got my bypass from design911, very good quality in my "limited" experience. I have links to their site (amongst others) on my website, here is a direct link to the correct page.
http://www.porschepassion.com/useful.htm
Al.
02-12-2005, 12:51 PM
#18
Aficionado
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Hooo yesss, there is a great difference in the exhaust note.
Check my page to see the diference (in images) of the stock cat vs Dansk bypass
http://www.cardomain.com/memberpage/449399/15
Check my page to see the diference (in images) of the stock cat vs Dansk bypass
http://www.cardomain.com/memberpage/449399/15
02-12-2005, 04:02 PM
#19
Instructor
Originally Posted by Andy Roe
Al,
Did you initially just replace the CAT? Did you notice much difference in the exhaust note?
Andy
Did you initially just replace the CAT? Did you notice much difference in the exhaust note?
Andy
I had already done the primary "cup" bypass, at which time i was running at approx 102 db, after the cat bypass I am up to 105 db, which is a problem on some UK trackdays. Sounds great, and is not to noisy internallly, the volume is only while you have your foot pressed hard on the "loud pedal".
Al.
02-13-2005, 02:23 PM
#20
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I thought there were two reasons for removing the cat, on older cars they can become blocked up and reduce performance and also that the engine is easier to chip with the cat removed. This might be total rubbish, but i thought i'd read it somewhere.
02-13-2005, 02:28 PM
#21
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When I had mine serviced last July, I was told that the CAT was breaking down & will need replacing soon. Hence my reason to replace it. Think I've made my mind up that it's got to be done!
02-14-2005, 05:05 PM
#22
Rennlist Member
Ok which one to get and why the diference in tube diameter.
Cargraphic sell one that looks like just a streight pipe and will come in at around £206
design 911 sell one that goes wider in the middle for around £300 with vat and postage. looking around FVD seem to sell the same one and if my math is correct will cost around the same at about £209 depending on exchange rate.
So which one to get? they both cost the same only one goes wider in the middle. any difference?
pic below -on the right is the cargraphic bypass pipe (the pic on the left is not a bypass) dont have a pic of teh design 911 one
Cargraphic sell one that looks like just a streight pipe and will come in at around £206
design 911 sell one that goes wider in the middle for around £300 with vat and postage. looking around FVD seem to sell the same one and if my math is correct will cost around the same at about £209 depending on exchange rate.
So which one to get? they both cost the same only one goes wider in the middle. any difference?
pic below -on the right is the cargraphic bypass pipe (the pic on the left is not a bypass) dont have a pic of teh design 911 one
02-14-2005, 05:12 PM
#23
Rennlist Member
just found this place.
http://www.powermarques.co.uk/sports%20ex.htm
the seems to be selling the same item for £164+vat i assume
see pic you can see that this one goes wider in the middle
http://www.powermarques.co.uk/sports%20ex.htm
the seems to be selling the same item for £164+vat i assume
see pic you can see that this one goes wider in the middle
02-14-2005, 07:37 PM
#25
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IMHO, the fat one is trying to look like you still have a cat......not that anyone would be trying to pull one over on the MOT, DOT, or DMV inspectors, right?
Nudge, nudge. Wink, wink.
BGL
Nudge, nudge. Wink, wink.
BGL
02-14-2005, 10:06 PM
#26
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Another option is: http://members.aol.com/SportsCarConvert/index.html
No experience with the product but they are certainly cheaper than a new cat.
Marc
No experience with the product but they are certainly cheaper than a new cat.
Marc
02-15-2005, 03:30 AM
#27
Three Wheelin'
Pesty,
The third one you posted is designed to "look" like the original cat. The photo looks like it's the Dansk unit which, if correct, actually has "some" silencer internals rather than just a straight through pipe. Advantage is a little less sound - better if you are fitting a non-standard or bypass exhaust too. The Dansk unit DOES have the fittings for the O2 sensor. Availalble in the UK from www.design911.co.uk
Design 911 also sell a bypass from Scart. It's much cheaper (around £169 + VAT) but looks like it doesn't have the O2 fitting although Design 911 could confirm this I'm sure. This one looks like it IS a straight through pipe.
It's important that you have the O2 fitting unless you modify the DME to cope without it otherwise the engine will run in a permanent rich mode. BTW, you will almost certainly have to fit a new O2 sensor - they don't come out easy!!!
Regards
Dave
The third one you posted is designed to "look" like the original cat. The photo looks like it's the Dansk unit which, if correct, actually has "some" silencer internals rather than just a straight through pipe. Advantage is a little less sound - better if you are fitting a non-standard or bypass exhaust too. The Dansk unit DOES have the fittings for the O2 sensor. Availalble in the UK from www.design911.co.uk
Design 911 also sell a bypass from Scart. It's much cheaper (around £169 + VAT) but looks like it doesn't have the O2 fitting although Design 911 could confirm this I'm sure. This one looks like it IS a straight through pipe.
It's important that you have the O2 fitting unless you modify the DME to cope without it otherwise the engine will run in a permanent rich mode. BTW, you will almost certainly have to fit a new O2 sensor - they don't come out easy!!!
Regards
Dave
02-15-2005, 10:22 AM
#28
Rennlist Member
Originally Posted by Computamedic
Pesty,
BTW, you will almost certainly have to fit a new O2 sensor - they don't come out easy!!!
Regards
Dave
BTW, you will almost certainly have to fit a new O2 sensor - they don't come out easy!!!
Regards
Dave
02-15-2005, 11:28 AM
#29
Burning Brakes
Just my .02 , when I installed the straight pipe in place of cat, I lost low end grunt off of corners, but gained a ton on the top end. Depending on track I can make it work for me. 92 euro 964 cup car