to cat, or not to cat
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2nd Gear
Joined: Apr 2008
Posts: 548
From:
to cat, or not to cat
my emissions is going to be done this month and afterwards i am thinking about going catless
questions:
has anyone gone catless, what do you like about it; not like about it; performance wise?
is being illegal worth it?
big difference in sound?
have u installed it yourself?
thanks guys!
questions:
has anyone gone catless, what do you like about it; not like about it; performance wise?
is being illegal worth it?
big difference in sound?
have u installed it yourself?
thanks guys!
1st Gear
Joined: Apr 2009
Posts: 62
From: Ca
I have done this on my Jetta 04 GLI that got totaled.
Spooled up much faster,got a check engine light on afterwards,had to install a spacer that placed the O2 sensor farther out of the airstream in the cat itself,not sure if the A4 will be the same problem.???
The sound,,,,I thought it sounded great!,just a slight low rumble & idle,& not obnoxtiously (SP) loud @ W.O.T. wide open throttle.
You will smell the unburned fuel more.
Not worth the fine if you get caught. Pretty pricey$$$$$
A cat is like having another muffler. So removing it made it sound better,,,,but if you go w/a big exhaust pipe like 3" & a straight through muffler/s out back,,,,it will be loud,IMO,,too loud.
Running two 2.1/4" pipes w/two straight through mufflers & no cat should sound pretty good.
The stock mufflers on my 08 A4,looks to be pretty much straight through ,but has a bend inside,but no baffles that causes the exhaust to change directions.
The APR mufflers are 2 1/4" straight through design from what an APR spokes person told me via Email.
Hope this helps a little.
Sorry different car but basically the same engine.
MBHD
Spooled up much faster,got a check engine light on afterwards,had to install a spacer that placed the O2 sensor farther out of the airstream in the cat itself,not sure if the A4 will be the same problem.???
The sound,,,,I thought it sounded great!,just a slight low rumble & idle,& not obnoxtiously (SP) loud @ W.O.T. wide open throttle.
You will smell the unburned fuel more.
Not worth the fine if you get caught. Pretty pricey$$$$$
A cat is like having another muffler. So removing it made it sound better,,,,but if you go w/a big exhaust pipe like 3" & a straight through muffler/s out back,,,,it will be loud,IMO,,too loud.
Running two 2.1/4" pipes w/two straight through mufflers & no cat should sound pretty good.
The stock mufflers on my 08 A4,looks to be pretty much straight through ,but has a bend inside,but no baffles that causes the exhaust to change directions.
The APR mufflers are 2 1/4" straight through design from what an APR spokes person told me via Email.
Hope this helps a little.
Sorry different car but basically the same engine.
MBHD
1st Gear
Joined: Apr 2009
Posts: 62
From: Ca
fater????
The spacer I had is simular to this one: http://forums.vwvortex.com/zerothread?id=4335899
You can disconnect the car battery & it should reset?
At least it did on my VW.
MBHD
The spacer I had is simular to this one: http://forums.vwvortex.com/zerothread?id=4335899
You can disconnect the car battery & it should reset?
At least it did on my VW.
MBHD
2nd Gear
Joined: Jan 2006
Posts: 960
From: Sylvania, OH
Buy a catless Downpipe that you can swap the stocker back in at emmission time. Get an APR or REVO tune and you will be automaticly stage 2 with the downpipe and the chip will make your light go away. That simulator / spacer is not gauranteed to work and does not work on some cars.
I have a catless DP on my GTI and APR tune. (HOLY **** is all I can say to that)
I have a catless DP on my GTI and APR tune. (HOLY **** is all I can say to that)
1st Gear
Joined: Apr 2009
Posts: 62
From: Ca
