Street Exhaust Options 964
07-03-2013, 05:35 PM
#17
Rennlist Member
Primary first. #8.
What a crazy looking exhaust system!
What a crazy looking exhaust system!
07-03-2013, 05:42 PM
#18
Rennlist Member
I'm constantly on here and other places looking for answers and trying to learn more. That's part of the fun. I've seen more than a couple RL members go from being total newbies... to buying garage lifts and pulling their engines out. Impressive stuff!
Enjoy it and come here to learn and share your experiences (pics occasionally please!).
07-03-2013, 05:51 PM
#19
Addict
Rennlist Member
Rennlist Member
The 964 exhaust has two mufflers - a primary muffler (#8 in the picture below) and a secondary muffler (#9 in the picture). It will also have either a catalytic converter or a 'bypass' pipe, depending on country of sale (#6 in the pic).
A 'cup pipe' or 'primary bypass' pipe will replace #8.
A 'G pipe', 'U pipe', etc. will replace #9.
You can also install an aftermarket catalytic converter bypass.
This is a 'cup pipe' or primary bypass:
This is a 'G pipe' or secondary bypass:
And this is a 'European' style catalytic bypass pipe:
A 'cup pipe' or 'primary bypass' pipe will replace #8.
A 'G pipe', 'U pipe', etc. will replace #9.
You can also install an aftermarket catalytic converter bypass.
This is a 'cup pipe' or primary bypass:
This is a 'G pipe' or secondary bypass:
And this is a 'European' style catalytic bypass pipe:
07-03-2013, 05:53 PM
#21
Rennlist Member
Join Date: Feb 2003
Location: Albuquerque, New Mexico, USA
Posts: 1,003
Received 108 Likes
on
63 Posts
My car has a G pipe and De-cat. A lot of people say it sounds great but sometimes I feel it is a bit too loud... I am contemplating switching to a Sport Cat with a Cup Pipe and replacing the final silencer or replacing the entire system.
This company also do a good quality complete system:
www.m-m-germany.de
As do FVD:
www.fvd.de
This company also do a good quality complete system:
www.m-m-germany.de
As do FVD:
www.fvd.de
So, the sec muffler went back in. In addition to the Cat BP, I also run a cup style airbox (also Fabspeed) and I find that the noise level with this combination is just about right.
Brian
Last edited by BGLeduc; 07-09-2013 at 02:47 PM.
07-03-2013, 05:54 PM
#22
Rennlist Member
Thread Starter
Nice... Thanks for the help guys. That was the diagram I was looking at...
Haha fortunately/unfortunately, I've already caught the bug with BMWs originally... I race an e36 and have a dd e90... It doesn't take long before you wake up one day and realize you have three cars...
Wouldn't have it any other way!
Haha fortunately/unfortunately, I've already caught the bug with BMWs originally... I race an e36 and have a dd e90... It doesn't take long before you wake up one day and realize you have three cars...
Wouldn't have it any other way!
07-03-2013, 06:18 PM
#24
Currently got the G-Pipe but wondering about also fitting the cup pipe. Not sure if these two combined will make it too loud?
Techically mine being a 93 I cant get rid of the cat so as this is getting old may have to look at sport cat options as well.
Techically mine being a 93 I cant get rid of the cat so as this is getting old may have to look at sport cat options as well.
07-03-2013, 06:22 PM
#25
07-03-2013, 06:52 PM
#26
Rennlist Member
I've been meaning to post a thread on the Ebay G pipe I bought, couldn't have been happier, really! especially for the price, really can't go wrong. In the end though, it is all personal preference 
07-03-2013, 11:00 PM
#27
Burning Brakes
Yes, yes! So true. Boy do I love the sound of starting a cold engine, sounds mean and grumpy!
I originally had just a primary exhaust bypass (Cup pipe), and it's a great sound and nice weight savings. After years of just the primary bypass, I purchased a used Fabspeed Cat Bypass (no affil) from a Rennlister who was selling his car... WOW, that was the sound I was really looking for. Also, the cat bypass bolted on with no modifications or gaps, perfect fit. It all works great with my Wong chip (93, Primary and Cat pass program).
It a nice deep, heavy breathing mechanical sound. I also hear more valvetrain music since the cat bypass doesn't have a large shield on it like the stock cat does. Yes it's a notch or two louder than just the just a primary exhaust delete, but definitely not too loud. Just sounds very strong, even my non-car loving friends (99% of my friends) love the sound and give it thumbs up.
For the complete package, drill your airbox also.
I originally had just a primary exhaust bypass (Cup pipe), and it's a great sound and nice weight savings. After years of just the primary bypass, I purchased a used Fabspeed Cat Bypass (no affil) from a Rennlister who was selling his car... WOW, that was the sound I was really looking for. Also, the cat bypass bolted on with no modifications or gaps, perfect fit. It all works great with my Wong chip (93, Primary and Cat pass program).
It a nice deep, heavy breathing mechanical sound. I also hear more valvetrain music since the cat bypass doesn't have a large shield on it like the stock cat does. Yes it's a notch or two louder than just the just a primary exhaust delete, but definitely not too loud. Just sounds very strong, even my non-car loving friends (99% of my friends) love the sound and give it thumbs up.
For the complete package, drill your airbox also.
One thing that I'd like to add, is that Steve Weiner has done some dyno testing which compared bypasses (I believe). If I remember correctly, the tests showed that the secondary bypass (G-pipe) may yield more 'functional' gains, by giving a bigger increase in midrange torque, compared to the stock setup. But I believe that the primary bypass may have given bigger gains in top end hp. In both cases, a chip optimized for your setup (which I don't have) maximized the gains. But please verify the accuracy of these statements with Steve - he'll give you the facts.
Is that your car in the avatar? If so, very nice!
07-04-2013, 01:53 AM
#29
Rennlist Member
Join Date: Jun 2010
Location: Detroit (Rock City); 1990 C4
Posts: 1,710
Likes: 0
Received 4 Likes
on
4 Posts
I bought a cup and a g-pipe within a week of each other. Tried Cup first: Ok, but it split my secondary. Tried cup+g: Loud, and not in a pleasant way. G-only was it for me, but I didn't mess with the catcon.
07-04-2013, 04:06 AM
#30
I really like the B&B header exhaust that I'm running, I looked a long time to find the right sound, not too low, burble-ee and boatlike, with just the right amount of snarl and I'm very pleased. It's hard to find something evocative of the earlier car's sound with these big fuel injected mills and even harder to hear samples.
See vid here at 10:28...
and 5:14 here...
Good luck with your decision!
See vid here at 10:28...
Good luck with your decision!