cat delete apr map

**johnnie27** · July 6th, 2011, 00:23

Hi everyone hope you are all well!

so just wanted to ask, has anyone done a secondary cat delete, i spoke with the APR folk here in oz and they have a file created to run with the cat delete...just curious to see if anyone thinks the mod is worth it

all i need to do is take the cats off and send away my ECU for the day, and they will load in the new software for her....

john

**hahnmgh63** · July 6th, 2011, 01:10

There are a quite a few on the list with the Primary Cat's deleted but only a few that have both deleted. I think Elevens & V8weight are running Catless.

**johnnie27** · July 6th, 2011, 01:36

Originally Posted by hahnmgh63

There are a quite a few on the list with the Primary Cat's deleted but only a few that have both deleted. I think Elevens & V8weight are running Catless.

thanks Mate, yeah i was just keen to see if yau'll thought taking 2 cats out and a new map would be worth the time?

**V8weight** · July 6th, 2011, 01:39

Originally Posted by johnnie27

thanks Mate, yeah i was just keen to see if yau'll thought taking 2 cats out and a new map would be worth the time?

Yes, it is!

**johnnie27** · July 6th, 2011, 01:47

Originally Posted by V8weight

Yes, it is!

oh so you have not cats at all on your beast! ?

i am talking about the ones at the bottom of the down pipes where the 2nd o2 sensor is

are the top ones hard to get at?? and tricks or advice.. thanks mate

**4everRS** · July 6th, 2011, 01:49

You'll have to take off the DP's in order to remove the pre-cats. Then they're not tough to get at.

**johnnie27** · July 6th, 2011, 01:54

ok can the dp's be removed when can is on hoist can you access them reasonably well?

**V8weight** · July 6th, 2011, 01:57

Here's the thread where I removed my pre-cats. Not that hard, but not easy by any means. Definitely not something to attempt with your Stanley screwdriver set.
http://www.rs6.com/showthread.php/21...light=downpipe
Here is the thread when I removed the main catalysts later on. I actually just cut the main cats out with a sawzall, gutted them, then welded them back in.
http://www.rs6.com/showthread.php/22...ight=downpipes

**johnnie27** · July 6th, 2011, 02:01

awesoem thanks man, i read on

thanks again for the help, i assume the turbo spool is a bit louder too!

**4everRS** · July 6th, 2011, 03:30

Ya, spool is more noticeable. REALLY noticeable with Pat's car. Totally catless and eisenmann exhaust.

**yokust** · July 6th, 2011, 04:20

I have APR as well, and running full catless on both my RS6's.

**kismetcapitan** · July 6th, 2011, 16:27

does anyone make a complete straight-through downpipe that would mate up with a catback? Seems to be a cleaner/better solution than gutting cats. Plus, gutting cats isn't any fun; I've done it on bike cats, and it's a messy, dusty affair with a drill, a Dremel, and a lot of swearing...

**speedtrapped** · July 6th, 2011, 17:08

i think milltek makes a complete straight solution to the turbos, DP' to exhaust

**kismetcapitan** · July 6th, 2011, 17:21

I checked their website, didn't see anything listed, but I think I'll give them a ring. For the past five years, I've driven a car with no cats, resonators, or mufflers. It's cheap - just 4" piping. But my future RS6 is meant to be the "civilized" car...but I love popping on overrun, so I'll see if they've got a resonated catback minus mufflers and straight catless downpipes. That should strike about the right balance of roar and hopefully not create highway drone, plus allow me to talk to my wife in the car without raising my voice. In my Skyline, we practically need headsets....

**johnnie27** · July 7th, 2011, 03:36

Originally Posted by V8weight

Here's the thread where I removed my pre-cats. Not that hard, but not easy by any means. Definitely not something to attempt with your Stanley screwdriver set.
http://www.rs6.com/showthread.php/21...light=downpipe
Here is the thread when I removed the main catalysts later on. I actually just cut the main cats out with a sawzall, gutted them, then welded them back in.
http://www.rs6.com/showthread.php/22...ight=downpipes

your right!! much more than just a stanley

my exh guys is booked doing headers for Hot rods and custom work for 2 weeks i will go see him then, i may just wimp out and do the cats i can see, replace them with pipe only. many thanks all!!

**johnnie27** · July 7th, 2011, 03:39

Originally Posted by yokust

I have APR as well, and running full catless on both my RS6's.

did you notice much difference ..ie before and after? matey

**kismetcapitan** · July 7th, 2011, 07:40

turbocharged cars HATE cats. Mufflers too. The more restrictions you remove, the happier they get.

**snoopra** · July 10th, 2011, 06:24

Yea, turbos love no resistances!

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