Best Exhaust Option for 964?

[dlpalumbo]

I have a 1990 964 C4. The car is very good except it has a modified exhaust that, for me (ans I'm sure others), is too loud at times. The secondary muffler has been removed and either the primary modified to accept a sport tip, or, a sport muffler has been installed. I am not sure if it has a cat bypass as I haven't dropped the panel yet to take a look.

I have purchased a used secondary as I was planning on returning exhaust to stock (I thought, at the time, I had a stock primary, not so sure now). However, I am considering putting a primary bypass on and using the secondary.

I need some guidance as to how this will sound. I like a good exhaust note, but dont appreciate the cabin booming with the sound and I dont like drawing attention when I use the throttle.

Also, what is impact of not having a cat, if, in fact, I do have a cat bypass. As the car sounds like its emitting noise from the driver's side (left hand drive), I get the feeling the cat (or bypass) is radiating sound, i.e., its thin walled. Is this common?

Thanks for your help,

Dan

[Gventure]

Dan - on my 92 C2 I first removed the secondary muffler and installed a G-pipe and it sounded good. Then I installed a cat bypass with the removed secondary muffler - it had a nice note but was just too loud sometimes. I reinstalled the secondary and now have nice grumble - having said that, I really don't like running the cat bypass due to environmental reasons so this weekend I'm going back to stock cat with a secondary G-pipe. When I get around to it, I'm looking into a 100-200 cell cat to see if that gives me the sound and performance w/o violating emissions.

Have fun.

G

PS - you shouldn't be hearing exhaust notes from the drivers side - make sure you haven't rusted through.

[Hamptonsam]

I have a stock cat, primary bypass, and stock secondary on my 90 C4 Cab. I like the sound, not too loud. I have not heard a car with a G-pipe (secondary bypass) so cannot compare the 2 setup's. I do want to go to a sport cat as soon as the funds are available.

[swmic]

I have a cat and primary bypass with the OEM secondary on my 91 C4. I really like the sound and get many compliments on it. It's not too loud at all.

I purchased the car with a FabSpeed dual outlet exhaust. It was way too loud for me and I could not wait to get rid of it. It sort of reminded me of a stock small block chevy with open headers. To me, it did not sound good at all.

[Tom W]

For a car driven on the street: I liked the secondary bypass (and rest stock) best. Great sound an legal loudness and emissions with good hp output. I was very unhappy with the Fabspeed dual outlet (way too loud).

[Cobalt]

I have a 100 cell dansk cat to keep it legal and a Custom fabricated Magnaflow SS muffler. The magnaflow has 0 restriction, weighs only 4-5 pounds and costs less than $200 plus fabrication. It sounds tremendous. It is noticeable but everyone says it is the best sounding C2 they have heard. It does not drone at 3k rpms like some and is quiet enough inside the car to listen to music at a moderate level. Has a comfortable DB level at idle and gets louder in the higher rpms and is legal at all tracks.