Cat Bypass Exhaust...
#1
Rennlist Member
Thread Starter
Cat Bypass Exhaust...
Has anyone fitted one of these?
Does it make much difference to the sound or performance?
Does it make much difference to the sound or performance?
#2
I had a cat bypass fitted not long after I got the car. Mine was actually fitted because the cat had collapsed and the mechanic thought that was causing my idle hunting problems (it wasn't!).
Didn't notice a difference in sound or performance.
Of course - you can see for yourself tomorrow!
Didn't notice a difference in sound or performance.
Of course - you can see for yourself tomorrow!
#3
Rennlist Member
Thread Starter
Thanks Dave, i've been watching one on ebay and just wondered... I think it's going to have to be the g pipe route then...
Does it matter about emissions on MOT's or are our 90's 964 exempt from emissions testing due to their year?
Does it matter about emissions on MOT's or are our 90's 964 exempt from emissions testing due to their year?
#5
Rennlist Member
Thread Starter
Thanks Andy, have you got any exhaust mods? I'm happy with the performance but i want a deeper sound...
#6
Addict
Rennlist Member
Rennlist Member
Nope. Everything is standard, but like Dave, my CAT is breaking down, so will probably put a by-pass on when I next have it serviced.
On my C4, I did have a G-Pipe fitted, but decided to return it to stock as it was rather loud! -you could hear me coming before you could see me! I may have a Primary By-pass put on when I have the CAT done though....We'll see!
On my C4, I did have a G-Pipe fitted, but decided to return it to stock as it was rather loud! -you could hear me coming before you could see me! I may have a Primary By-pass put on when I have the CAT done though....We'll see!
#7
Rennlist Member
I had the cat bypass installed and decided to removed it. Combined with the primary bypass it was just too loud. I had even set off a few car alarms
My Cat is getting old too and I think has developed a rattle. Has anyone upgraded their cat? or is the rule "just bypass it when it goes"?
My Cat is getting old too and I think has developed a rattle. Has anyone upgraded their cat? or is the rule "just bypass it when it goes"?
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#8
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I'm running a cat bypass with a Gemballa primary muffler, which is essentially a primary bypass, and I think the exhaust note is just right. I also had a secondary bypass fitted but it was too loud for my wife.
My chip tuner makes a chip to address the cat bypass but not either of the muffler bypasses. I'm guessing that the cat bypass may give few more ponies.
My chip tuner makes a chip to address the cat bypass but not either of the muffler bypasses. I'm guessing that the cat bypass may give few more ponies.
#9
Drifting
I have a G pipe, you'll hear it tomorrow..........I guess.
It might be difficult but "round the corner" on my website has Daves, mine, Iains, and Christers cars on them, all with differing exhaust options.....
Kevin
It might be difficult but "round the corner" on my website has Daves, mine, Iains, and Christers cars on them, all with differing exhaust options.....
Kevin
#10
Super Duper Moderator
Lifetime Rennlist
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Lifetime Rennlist
Member
In some of the older threads (2002/2003) there seemed to be alot of early interest in cat. bypasses but it seems like alot of guys who fitted them took them off due to foul smell and just too loud.
Any advice on a high-flow cat? I guess they are alot more expensive than a cat bypass and the 100-200 cell ones don't last long.
Marc
Any advice on a high-flow cat? I guess they are alot more expensive than a cat bypass and the 100-200 cell ones don't last long.
Marc
#12
Rennlist Member
Thread Starter
Thanks Garrett, i must've have missed the additional links you placed on that thread... SOUNDS GREAT!
Cheers!
(ps, finished that new 993 style Roof today!!!!!)
Cheers!
(ps, finished that new 993 style Roof today!!!!!)
#13
Addict
Rennlist Member
Rennlist Member
I did a before after dyno test before and after cat bypass pipe back in '92 - only other mod was Ruf 98 octane chip and Ruf cup crossover pipe and it cost power - I don't recall how much it lost but I remember putting on a Porsche pre silencer instead of the cat and the lost power returned. FWIW
#15
Rennlist Member
This i sprobably a stupid question but do you need to have the car remapped/chiped if you bypass the cat?
Just found out I will be getting a small bonus £200 ish so I need to spend it before the misses finds out
ps wheres the best place to buy a cat bypass
Just found out I will be getting a small bonus £200 ish so I need to spend it before the misses finds out
ps wheres the best place to buy a cat bypass