Piggies just gutted

[apena1371]

I've searched the forums with no luck, so here's my first post.I gutted my pre cats yesterday fully expecting to get a cel. To my surprise I've not received one. I've put the car through its paces driving it hard, it feels awesome by the way, but no cel. Could my car by chipped already? Any way to check? Or am i jumping the gun here and should get a cel soon? 07 S4 6 speed.

[skhan91]

I've searched the forums with no luck, so here's my first post.I gutted my pre cats yesterday fully expecting to get a cel. To my surprise I've not received one. I've put the car through its paces driving it hard, it feels awesome by the way, but no cel. Could my car by chipped already? Any way to check? Or am i jumping the gun here and should get a cel soon? 07 S4 6 speed.

nice, how was the gutting process? any tips? im thinking about doing mine

[TarlCabot]

I've searched the forums with no luck, so here's my first post.I gutted my pre cats yesterday fully expecting to get a cel. To my surprise I've not received one. I've put the car through its paces driving it hard, it feels awesome by the way, but no cel. Could my car by chipped already? Any way to check? Or am i jumping the gun here and should get a cel soon? 07 S4 6 speed.

gutting the "Pre-cats" imho ... is the best option, NO cel ;)
had you done both... with out a tune or spacers you would have a cel

[Koopsdeville]

Cel should come after 80k. -Gutted mine roughly a month ago. Great sound and better performance. If u do get a cel u need to buy the 90 degree o2 spacers. The straight ones will make the o2 sensors hit each other. Haven't got a cat cel since

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[Koopsdeville]

For the record, I have the exact same car. U have any issues of rough idle at cold start? Not trying to hijack ur post, sorry

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[apena1371]

http://www.audizine.com/forum/showth...n-Piggies)-FAQ was the post that i used to gut them. Gutting them was super easy it took no time at all. Removing them was a pain, there are some hard to reach bolts /nuts that are going to test your patience. The removal time was about 4 hrs, gutting 30 min, and install was about 2hrs. It should be faster if you have help, i decided to tackle this on a weekday so i was on my own. This was the write up i used to remove the pre-cats http://www.cuccarogarage.com/diy-aud...npipe-removal/ great write by the way.

[apena1371]

No issues yet. Knock on wood.

[skhan91]

im thinking having my exhaust guy just leave the dps on the car and cut the precats out and welp in straight 2.5" of piping instead. might be easier that way

[Koopsdeville]

I contemplated cutting the pre cat out but in my opinion it's probably better to gut. I don't know about emissions where u live but they may do a visual inspection for the cat. If they look like they're there then they can only assume so. A straight pipe would say otherwise

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[richB7S4]

I've searched the forums with no luck, so here's my first post.I gutted my pre cats yesterday fully expecting to get a cel. To my surprise I've not received one. I've put the car through its paces driving it hard, it feels awesome by the way, but no cel. Could my car by chipped already? Any way to check? Or am i jumping the gun here and should get a cel soon? 07 S4 6 speed.

One way to find out if your ECU is flashed is through VCDS/VAG. Another way is to look at your ecu housing to see if it had been opened, doubt that it is chipped since tunes are now software flash.

[jr1415us]

CEL will illuminate with a couple days. After I installed my Fast Intentions DPs the light came on during the second day of driving.

[Terry.Reese]

Won't O2 spacers at the lower set make the CEL not come on?

[BCsniper]

It took mine 75 miles to trigger the CEL when I had piggies.

Spacers or a tune will fix the issue

[apena1371]

It took mine 75 miles to trigger the CEL when I had piggies.

Spacers or a tune will fix the issue

Thanks. I was planning on the JHM tune anyway. Just expecting a cel by now.

[jakeoboy67]

the ecu has to "evaluate" the performance of your catalytic converters, it takes a while (15-20 mins at hwy speeds) to actually trigger the CEL.

every OBD2 car goes through a cycle similar to the one in this picture

[pchrist]

Does the sound change?


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[neilpaku]

I'm also curious as to any improvement in MPG - not that it would affect my decision but just interested in what, if any, better mileage is gained.

[apena1371]

I've searched the forums with no luck, so here's my first post.I gutted my pre cats yesterday fully expecting to get a cel. To my surprise I've not received one. I've put the car through its paces driving it hard, it feels awesome by the way, but no cel. Could my car by chipped already? Any way to check? Or am i jumping the gun here and should get a cel soon? 07 S4 6 speed.

Well I may never know if I'd get a cel because I got the JHM 91 tune 😃

[apena1371]

I'm also curious as to any improvement in MPG - not that it would affect my decision but just interested in what, if any, better mileage is gained.

I will have to keep an eye out on my next couple of fill ups

[neilpaku]

Just loosened up the sensors with the blue wrench today in prep for sensor extensions - now nicely coated threads with anti-seize. Was a real bear to remove them with the sensors still installed. The reassembly should be much easier.

[Silver Streakin]

CEL will illuminate with a couple days. After I installed my Fast Intentions DPs the light came on during the second day of driving.

2nd

Done it twice, same results. And as said above, the straight spacers don't work since the sensor point at each other. You need the adjustable ones. Or pay for a tune.

[roboto_1337]

I've searched the forums with no luck, so here's my first post.I gutted my pre cats yesterday fully expecting to get a cel. To my surprise I've not received one. I've put the car through its paces driving it hard, it feels awesome by the way, but no cel. Could my car by chipped already? Any way to check? Or am i jumping the gun here and should get a cel soon? 07 S4 6 speed.

Another way to check is to hit the rev limiter... Depending on the tune the rev limiter may have been changed. Stock rev limit is 7200 rpm. JHM tune rev limit is 7500.

You don't need to pin it to find it, just bounce it quick when the engine is properly warmed up.

[roboto_1337]

Won't O2 spacers at the lower set make the CEL not come on?

the spacers change the gas velocity and trick the ECU into thinking that the pre-cats are still in tact. So in theory... yes.

I think these ones are nice... for a spacer... http://www.streettunedmotorsports.co...ting_11620.htm