Need help on exhaust
Thread Starter
3rd Gear
Joined: Jun 2013
Posts: 3
Likes: 0
From: Woodstock. Georgia
Need help on exhaust
I have an 1989 C4 with 3.6. I am trying to figure out what is the best exhaust setup. Currently it was totally stock, i removed secondary muffler and like the sound and performance. I also see primary muffler bypasses which I assume would use the secondary muffler as silencer. I know my cat should be replaced but i want to understand what is the best route to go. I don't want anything unreasonably loud but i do enjoy the growl. What route should i pursue? Thanks in advance for the help.
Burning Brakes
Joined: Jun 2002
Posts: 1,198
Likes: 43
From: Seattle
Welcome to Rennlist! You are in luck... there is a wealth of information about this topic that you will find, as it has been discussed a multitude of times (including recently). Use the search function to find everything and more that you could ever want to know.
Also, post a few pics of your car!
Good luck!
Also, post a few pics of your car!
Good luck!
Thread Starter
3rd Gear
Joined: Jun 2013
Posts: 3
Likes: 0
From: Woodstock. Georgia
Thanks Eric for the response. I did search a few times well before this post but I could not find exactly what i wanted. When you search for 964 exhaust or exhaust (or many others) you come up with thousands of posts that I never seemed to find the answer on. I did learn how to diagnose my cruise control problems though. I will continue searching.
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Rennlist Member
Joined: Dec 2003
Posts: 7,211
Likes: 490
From: NC
Gabassin,
There are fans of either the primary or secondary bypass. Some don't like the deeper, woof-woof sound of the secondary bypass. That's personal, both definitely liven up the 964 experience. I read quite a few posts were people thought the secondary bypass and a cat bypass was rather loud and switched to a primary bypass. Since you mentioned it above, I thought I would add that into the mix.
I love the sounds from my primary bypass, the sound was made so much better when I added a cat bypass. A little louder, but much more mean and gruff sounding (especially when starting a cold engine!). There was also increased mechanical noise (valves), since the big heat shield is removed when the cat bypass was added. Sounds very race 911 to me, but not too loud for the neighborhood or my kids in the backseat. But get pass 4000 or floor it and boy does it roar!
I happened to have a couple recent clips from my phone, sorry about the quality but gives you an idea of how it sounds in the neighborhood.
There are fans of either the primary or secondary bypass. Some don't like the deeper, woof-woof sound of the secondary bypass. That's personal, both definitely liven up the 964 experience. I read quite a few posts were people thought the secondary bypass and a cat bypass was rather loud and switched to a primary bypass. Since you mentioned it above, I thought I would add that into the mix.
I love the sounds from my primary bypass, the sound was made so much better when I added a cat bypass. A little louder, but much more mean and gruff sounding (especially when starting a cold engine!). There was also increased mechanical noise (valves), since the big heat shield is removed when the cat bypass was added. Sounds very race 911 to me, but not too loud for the neighborhood or my kids in the backseat. But get pass 4000 or floor it and boy does it roar!
I happened to have a couple recent clips from my phone, sorry about the quality but gives you an idea of how it sounds in the neighborhood.
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RL Technical Advisor
Joined: May 2001
Posts: 11,870
Likes: 75
From: Portland Oregon
Race cars, OTOH, are totally different and there are better solutions for those vehicles,...
Three Wheelin'
Joined: Jan 2007
Posts: 1,746
Likes: 32
From: London UK & Paris FR
the difficulty is to get rid of the dip in the torque curve (also find in the BHP curve) between 4700 to 5700 rpm witch the cup & bypass would generaly give ....this is also exactly where you need the top power torque to be...
at 107 db it sound not so much restrictive, but it probably still is
at 107 db it sound not so much restrictive, but it probably still is
Racer
Joined: Jan 2006
Posts: 497
Likes: 1
From: Brisbane Australia