Street Exhaust Options 964
#47
Race Car
Ok, nice - I'm sure it sounds awesome but do you notice small old ladies toppling over
Inexplicably when you drive past? Or car alarms going off?
That must be a heck of a lot louder
than 95 db ie my track max level.
Inexplicably when you drive past? Or car alarms going off?
That must be a heck of a lot louder
than 95 db ie my track max level.
#48
Might be a downgrade from that exhaust, but try doing either cat bypass and no primary or no secondary. The only setup I ever tried that had the crackle/pop was with the cat in place and both mufflers out. Cool for about a month with city driving, but just too loud.
#49
Race Car
Thanks Alex - I thought it may be the cats.
The pic is just there as design illustration ie of the 2 box next to one another w mixing pipe in mid.
The pic is just there as design illustration ie of the 2 box next to one another w mixing pipe in mid.
#50
pipes and more
Just my pennie and a half. I have the cup pipe and also the J pipe which is the G pipe but the long neck. The cup sounds like a P car has a good race sound to it makes a smile on your face when you are on the pipe. The J has a muscle car sound but deeper than a G pipe. Also makes ya smile. I was at the muffler shop and almost had a cup made for 50 American but found one for good price,
Now in the maket for a cat delete to see how that is if anyone has one for sale .. Both pipes are great ....
Now in the maket for a cat delete to see how that is if anyone has one for sale .. Both pipes are great ....
#52
Race Car
Just to answer my question re the dual box with cross feed above - doesn't work well
with the hot cams on my 3.8 per a local friend ... Nor does the x-pipe ala GT3s ...
Glad I found someone with first hand experience, so dual in/out single box it is.
Now re the comments above re g pipe and cup pipes - are you using any mufflers beside the cats?? Per my first post, I need a quieter sound to keep driving at the local track as it gets encroached on by urban sprawl.
with the hot cams on my 3.8 per a local friend ... Nor does the x-pipe ala GT3s ...
Glad I found someone with first hand experience, so dual in/out single box it is.
Now re the comments above re g pipe and cup pipes - are you using any mufflers beside the cats?? Per my first post, I need a quieter sound to keep driving at the local track as it gets encroached on by urban sprawl.
#53
@Anyone going down the complete route of secondary bypass, catalytic removal/sport cat, chip, suspension etc. i can recommend rennline engine mounts (left and right side rear). to my opninion the reatly improve the feeling (no affiliation). I put some very strong thin white tape between body and metal to prevent metal to metal contact. but the feeling is as I think it should be in a 964. it feels mechanical and you can feel the engine, relly nice when you have the other mods.
@Hiwind: do you have something like a schema/picture of the exaust configuration you mean with "so dual in/out single box it is." Thanks
@Hiwind: do you have something like a schema/picture of the exaust configuration you mean with "so dual in/out single box it is." Thanks
#55
and on the inside the exhaust flows from both cilinder banks meet up? or they do not meet up (that is what you mean with single out then right?) and what is the angle of the exhaust flows respective to one another where they meet up (I grew up with 2 stroke where exhaust really means big difference, I understand 4stroke this effect is relatively smaller, but you probably know this also).
#56
HiWind,
We have an Andial built 3.8 liter 993 as one of the Fabspeed in house development cars....I designed a new single muffler for it that is not too loud yet picks up mid range torque and top end power....what is the dB limit of the tracks you run?
We have an Andial built 3.8 liter 993 as one of the Fabspeed in house development cars....I designed a new single muffler for it that is not too loud yet picks up mid range torque and top end power....what is the dB limit of the tracks you run?
#57
Three Wheelin'
My recollection is that the 993 dual outlet exhaust system was the main reason the 1995 993 horsepower jumped to 272 from the 247 of the 964. The system can be adapted to the 964 but it requires redoing the manifold attachment, etc.....I don't recall all the details.
#58
Race Car
and on the inside the exhaust flows from both cilinder banks meet up? or they do not meet up (that is what you mean with single out then right?) and what is the angle of the exhaust flows respective to one another where they meet up (I grew up with 2 stroke where exhaust really means big difference, I understand 4stroke this effect is relatively smaller, but you probably know this also).
I shd add that I have 993rs cams
Last edited by HiWind; 11-22-2013 at 04:40 PM.
#59
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Join Date: Dec 2009
Location: Hertfordshire, UK
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I've posted this before but thought it might be of interest to some people :-)
Hayward and Scott cat bypass and silencer (does away with primary and secondary)
Check out this video on YouTube:
Hayward and Scott cat bypass and silencer (does away with primary and secondary)
Check out this video on YouTube:
#60
Just remember that not all X pipes are created equal, and the size of the opening in the middle matters very much. We use cast X's to keep internal flow as smooth as possible and to control exactly the size of the opening.