Catted DPs

[Mbmw5]

Originally Posted by Sharif507

$3,200 with install included, the shop owner is a good friend of mine, plus i spent close to 30k on parts for the m5. i havnt gotten the chance to get it on the dyno, but you can def feel the car more responsive in a way that only a driver understands in his own car. i could easily say the ams catted dps are the best mod ive done to my car so far. akra + ams catted dps = glory. akra alone, not so much.

Great. Thanks for the feed back. �

[PetrolFumes]

Originally Posted by Spinny02

SS makes a lot of racing cats, they are know for this. That's who I would pick out of the two.

Equally as expense as the Noelle DPs though?

[M5stallion]

Gmd gain 1mph traps with intake and 200cell cat, you decide whether it is worth it or not...,

[rafaele92]

u gain any power with catted DP ?

i want to use them in my m5 cp .

[gmd2003]

Originally Posted by MPowerrF10

Equally as expense as the Noelle DPs though?

Cheaper actually but not by much . My problem with the Noelle cats is with the cell count they use to ensure CEL the gains will be minimal . Despite the ECU limiting the gains up top I picked up 1mph trap speed and .2 seconds off my quarter mile , that's a solid gain . The increase in sound was massive and I have zero fuel smell , and much faster turbo spool up . I'm very happy with SS , bc they are 200 cell I accepted the fact I might have an emissions code down the road . SS uses HJS 200 cell race catylzers , the highest flowing , highest quality available( used in the 991 GT3 as OEM )

[PetrolFumes]

Originally Posted by gmd2003

Cheaper actually but not by much . My problem with the Noelle cats is with the cell count they use to ensure CEL the gains will be minimal . Despite the ECU limiting the gains up top I picked up 1mph trap speed and .2 seconds off my quarter mile , that's a solid gain . The increase in sound was massive and I have zero fuel smell , and much faster turbo spool up . I'm very happy with SS , bc they are 200 cell I accepted the fact I might have an emissions code down the road . SS uses HJS 200 cell race catylzers , the highest flowing , highest quality available( used in the 991 GT3 as OEM )

Good stuff..i might be leaning towards AMS though since i hear people are having a lot of success with them and they are almost half the price

[wrsbmw]

Originally Posted by gmd2003

Cheaper actually but not by much . My problem with the Noelle cats is with the cell count they use to ensure CEL the gains will be minimal . Despite the ECU limiting the gains up top I picked up 1mph trap speed and .2 seconds off my quarter mile , that's a solid gain . The increase in sound was massive and I have zero fuel smell , and much faster turbo spool up . I'm very happy with SS , bc they are 200 cell I accepted the fact I might have an emissions code down the road . SS uses HJS 200 cell race catylzers , the highest flowing , highest quality available( used in the 991 GT3 as OEM )

They are reducing the cell count by 60% and removing one obstruction in the path of the exhaust flow so how will the gains be minimal? Even if the SS have a 200 cell cat and the Boysen still has a 400 cell cat, the cat is an obstruction to air flow, I don't see how the gain in the Noelle is going to be minimal. It would be less than a catted DP with 200 cells but the rest of the gain due to only one cat will be there and in addition, the fit is the same as the OEM. I definitely don't want more CELs so I will live with the lesser gain and hopefully also increase my sound.

[gmd2003]

Originally Posted by wrsbmw

They are reducing the cell count by 60% and removing one obstruction in the path of the exhaust flow so how will the gains be minimal? Even if the SS have a 200 cell cat and the Boysen still has a 400 cell cat, the cat is an obstruction to air flow, I don't see how the gain in the Noelle is going to be minimal. It would be less than a catted DP with 200 cells but the rest of the gain due to only one cat will be there and in addition, the fit is the same as the OEM. I definitely don't want more CELs so I will live with the lesser gain and hopefully also increase my sound.

Some have had more than just one 400 cell , it seems they have been variable in what they (Noelle) have done . In my opinion going from 600 cell stock to 400 isn't enough of a change for 4k.

[wrsbmw]

Originally Posted by gmd2003

Some have had more than just one 400 cell , it seems they have been variable in what they (Noelle) have done . In my opinion going from 600 cell stock to 400 isn't enough of a change for 4k.

Check with Spinny on that. It's going from 1000 cells to 400 cells. I believe that the AMS had 300 cells in their cat. In addition, even though the GT3 may be using the 200 cell cat, that doesn't ensure no CEL on the M5 since the exhaust volume is obviously going to be higher off the 4400 cc V8 vs a flat 6 with 600CC less displacement. As to the cost, oh well, it's still OEM and this modding game isn't cheap nor are the cars.

[gmd2003]

Originally Posted by wrsbmw

Check with Spinny on that. It's going from 1000 cells to 400 cells. I believe that the AMS had 300 cells in their cat. In addition, even though the GT3 may be using the 200 cell cat, that doesn't ensure no CEL on the M5 since the exhaust volume is obviously going to be higher off the 4400 cc V8 vs a flat 6 with 600CC less displacement. As to the cost, oh well, it's still OEM and this modding game isn't cheap nor are the cars.

There are two separate catylzers in the OEM DP's . The primary is 600 cell and the secondary is 400 cell . Flow through them is more determined by the highest cell count and the catylzers design than adding up the primary and secondary cell counts . So you are going from a 600 cell to a 400 cell restriction .

[wrsbmw]

Originally Posted by gmd2003

There are two separate catylzers in the OEM DP's . The primary is 600 cell and the secondary is 400 cell . Flow through them is more determined by the highest cell count and the catylzers design than adding up the primary and secondary cell counts . So you are going from a 600 cell to a 400 cell restriction .

I am just looking at it from a series resistance point of view and in that case, it's a 60% reduction. If it's a reduction from 600 to 400 then it's still a 33% reduction and from 600 to 300 would be a 50% reduction. From 600 to 200 would be a 66% reduction.

Spinny has said that the gains from the Noelle's are about 10hp as measured on a Dyno so we actually know the number. That is a bare stock increase, it will likely be less when combined with the other changes and I suspect the real observable gain is mostly in sound. I prefer no CEL because I don't work on my own cars these days, I just drive them so I don't want them in the shop.

[gmd2003]

Originally Posted by wrsbmw

I am just looking at it from a series resistance point of view and in that case, it's a 60% reduction. If it's a reduction from 600 to 400 then it's still a 33% reduction and from 600 to 300 would be a 50% reduction. From 600 to 200 would be a 66% reduction.

Spinny has said that the gains from the Noelle's are about 10hp as measured on a Dyno so we actually know the number. That is a bare stock increase, it will likely be less when combined with the other changes and I suspect the real observable gain is mostly in sound. I prefer no CEL because I don't work on my own cars these days, I just drive them so I don't want them in the shop.

You're view is reasonable , I just prefer to make a bigger move if Im changing a part out . To be clear though an emissions CEL light from the secondary o2'swould in no way effect the performance of the car or require it to be in the shop .

[wrsbmw]

Originally Posted by gmd2003

You're view is reasonable , I just prefer to make a bigger move if Im changing a part out . To be clear though an emissions CEL light from the secondary o2'swould in no way effect the performance of the car or require it to be in the shop .

It would mean I have an issue with inspection and would need to change pipes for inspection I think. I don't know what the solution is for state inspection so that is why I didn't go with another DP. I wasn't even going to get them until I found out that Noelle is Boysen and that there is no CEL. I am hoping for some good sound here. The Dinan exhaust is really nice but I want a little more sound on wot or acceleration.

[gmd2003]

Originally Posted by wrsbmw

It would mean I have an issue with inspection and would need to change pipes for inspection I think. I don't know what the solution is for state inspection so that is why I didn't go with another DP. I wasn't even going to get them until I found out that Noelle is Boysen and that there is no CEL. I am hoping for some good sound here. The Dinan exhaust is really nice but I want a little more sound on wot or acceleration.

Gotcha , being in a no inspection state has it's perks