964 exhaust mods
Discussion
Yes it probably has been done before, but I wasnt into it then. Whats the best way, without replacing manifolds and cat (depending on cars age) to get a loud 964?
Been advised cup pipe,G pipe,I guess those will replace silencers,will that be to loud.What about cat bypass....
Also whats the best induction system....
Any other cheap performance related mods out there...
Do turbo 2 cups fit standard width body shape?
Been advised cup pipe,G pipe,I guess those will replace silencers,will that be to loud.What about cat bypass....
Also whats the best induction system....
Any other cheap performance related mods out there...
Do turbo 2 cups fit standard width body shape?
Right, cup bypass is loud, too loud for me on a daily driver, and personally I felt unless on tickover or WOT it sounded rough. G pipe sounds nice, deep and smooth, probably the best bet, also cheap and easy to fit and removes the usually rotten rear box!
Replacing cat is worthwhile if your cars age allows, mine did, I replaced as my cat had some cracks, and a decat was cheap, I noticed little or no sound difference, and little or no performance improvement.
I tried an open airbox and found zero performance improvement, and not as much induction noise as I expected. I returned to a standard airbox for neatness and the fact that Porsche clearly designed it that way for a reason.
The 993 system can be fitted without too much difficulty (don't expect it to be a 5 minute job) that was due to be one of my future mods, 993 manifolds running to two bespoke manifolds or even an early banana box.
It depends whether your looking for power or noise. If you want noise then a g pipe will be the cheapest, easiest and nicest sounding way to do it. If you go G and cup pipe it would sound mad!
Replacing cat is worthwhile if your cars age allows, mine did, I replaced as my cat had some cracks, and a decat was cheap, I noticed little or no sound difference, and little or no performance improvement.
I tried an open airbox and found zero performance improvement, and not as much induction noise as I expected. I returned to a standard airbox for neatness and the fact that Porsche clearly designed it that way for a reason.
The 993 system can be fitted without too much difficulty (don't expect it to be a 5 minute job) that was due to be one of my future mods, 993 manifolds running to two bespoke manifolds or even an early banana box.
It depends whether your looking for power or noise. If you want noise then a g pipe will be the cheapest, easiest and nicest sounding way to do it. If you go G and cup pipe it would sound mad!
If you go to this site click on reviews on the left hand side, then select running reports, click on the 17th car down (Phil Raby) there is an article called safe and sound where they talk about drilling the air box for a better induction sound.
I'm sure there will be another report in there somewhere which tackle exhaust options.
I'm sure there will be another report in there somewhere which tackle exhaust options.
I believe you liked the sound of mine at the pub a few sunday's ago?! For reference, I have a drilled airbox, a G-pipe and a cat bypass. I wrote a G-pipe fitting guide a while back, which is here if it helps: http://forums.rennlist.com/rennforums/showthread.p...
The problem i suffer is having to pay the extra for the loud trackdays. The drilled airbox adds induction noise/bark, the catbypass mainly adds bassnote to the exhaust and the G-pipe just increases the harshness and volume of the exhaust. With my mods i was measured at 102db.
HTH
The problem i suffer is having to pay the extra for the loud trackdays. The drilled airbox adds induction noise/bark, the catbypass mainly adds bassnote to the exhaust and the G-pipe just increases the harshness and volume of the exhaust. With my mods i was measured at 102db.
HTH
Cat bypass allows for a slightly free'er breathing system, i replaced mine as it had disintegrated internally. If you replace it i'd advise a stainless one with an O2 sensor hole. Plus, you'll almost certainly need a new O2 sensor, they usually fall apart when you try to remove them.
If its simply an increase in noise you're after, a cat bypass is only a subtle increase. The simplest/cheapest thing is to drill some holes in your airbox cover, and install a G-pipe (iirc £80).
The cup pipe mod does sounds good too though. There's not much in it really. But the G-pipe is easier to DIY, and is a bigger weight reduction than replacing the primary, as the secondary silencer is about 20 times heavier than the G-pipe.
I suppose a corner balance might be an idea afterwards as you're losing a fair amount of weight from one corner.
If its simply an increase in noise you're after, a cat bypass is only a subtle increase. The simplest/cheapest thing is to drill some holes in your airbox cover, and install a G-pipe (iirc £80).
The cup pipe mod does sounds good too though. There's not much in it really. But the G-pipe is easier to DIY, and is a bigger weight reduction than replacing the primary, as the secondary silencer is about 20 times heavier than the G-pipe.
I suppose a corner balance might be an idea afterwards as you're losing a fair amount of weight from one corner.
Too loud! I know a guy that has both - his neighbour phoned the environmental health dept. Being in the car gives you a headache after a while too. I'd start with one, and see how you get on.
Here's a short clip where you can hear mine flatout (cat bypass + open airbox + secondary silencer bypass): http://www.youtube.com/watch?v=flfIikyXTis
Here's a short clip where you can hear mine flatout (cat bypass + open airbox + secondary silencer bypass): http://www.youtube.com/watch?v=flfIikyXTis
cup pipe AND G pipe will be very load!....I managed to stick with it for about 2 months then couldn't take it any longer! Journeys of over 30 minutes became very draining!...Wife hated it ( thats a positive then!)....No seriously, just go for the tried and tested cat by-pass and cup pipe...I believe the weight saving on the primary silencer is greater than on the secondary one and like you have just said,the weight loss is balanced across the rear of the car.
Had a G pipe on it's own, nice loverly low grumble, measured 104dB. Now have a Dansk dual outlet, which gives a more raspy sound, slightly louder as I'm using the G pie with it. Not loud enough for me, so I'm going with a 100cell cat when I can get one.......
See some options down at the worcester park on Oct 14th we all have distinctly differing cars/exhausts.
Kevin
See some options down at the worcester park on Oct 14th we all have distinctly differing cars/exhausts.
Kevin
There is negligible difference in hte weight of the primary and secondary silencers - they both come in at about 22lbs IIRC.
General concensus seems to be that cup pipe gives more top end power and G pipe gives more mid range torque but both together is less than the sum of their parts. You'll need a remap to get any gains and the biggest power gains comes from the cat bypass.
General concensus seems to be that cup pipe gives more top end power and G pipe gives more mid range torque but both together is less than the sum of their parts. You'll need a remap to get any gains and the biggest power gains comes from the cat bypass.
gregorio! said:
Cat bypass allows for a slightly free'er breathing system, i replaced mine as it had disintegrated internally. If you replace it i'd advise a stainless one with an O2 sensor hole. Plus, you'll almost certainly need a new O2 sensor, they usually fall apart when you try to remove them.
If its simply an increase in noise you're after, a cat bypass is only a subtle increase. The simplest/cheapest thing is to drill some holes in your airbox cover, and install a G-pipe (iirc £80).
The cup pipe mod does sounds good too though. There's not much in it really. But the G-pipe is easier to DIY, and is a bigger weight reduction than replacing the primary, as the secondary silencer is about 20 times heavier than the G-pipe.
I suppose a corner balance might be an idea afterwards as you're losing a fair amount of weight from one corner.
Dammit just bought a replacement Second silencer today as wellIf its simply an increase in noise you're after, a cat bypass is only a subtle increase. The simplest/cheapest thing is to drill some holes in your airbox cover, and install a G-pipe (iirc £80).
The cup pipe mod does sounds good too though. There's not much in it really. But the G-pipe is easier to DIY, and is a bigger weight reduction than replacing the primary, as the secondary silencer is about 20 times heavier than the G-pipe.
I suppose a corner balance might be an idea afterwards as you're losing a fair amount of weight from one corner.
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