Who can get me cheapest DOWNPIPES ?

[AstonMartian777]

Looking to get downpipes, catless, cheapest, thank you !

[bigbrian]

Motive Concepts are $1599 I believe. I don't think they get that much cheaper but I could be wrong.

Brian

[AstonMartian777]

Maybe some vendors can hook me up

[C's Bimmer]

I just had the AMS Catted Downpipes installed, along with the P3 Vent Gauge, upped the BMS Tune to 5psi and had the Alcantara Steering Wheel installed. MY GOD - This car is a freakin beast now -- it's so INSANE!!!!

[bigbrian]

Originally Posted by C's Bimmer

I just had the AMS Catted Downpipes installed, along with the P3 Vent Gauge, upped the BMS Tune to 5psi and had the Alcantara Steering Wheel installed. MY GOD - This car is a freakin beast now -- it's so INSANE!!!!

Careful with that +5 my man... Personally I would run a bit of race fuel (110 or 112) mixed in the tank with that setting just for "insurance" if you know what I mean.

Brian

[AstonMartian777]

Originally Posted by C's Bimmer

I just had the AMS Catted Downpipes installed, along with the P3 Vent Gauge, upped the BMS Tune to 5psi and had the Alcantara Steering Wheel installed. MY GOD - This car is a freakin beast now -- it's so INSANE!!!!

Getting catted downpipe is the biggest waste of money, alcantara wheel on the other hand is super sexy , how are you liking the gauge ?

[C5driver]

Originally Posted by AstonMartian777

Getting catted downpipe is the biggest waste of money

Why?

[AstonMartian777]

Originally Posted by C5driver

Why?

you will barely get any results, whatever he is feeling, it's just in his head, and the price of catted after market dp is over 2k, that why in my opinion.

[michel lane]

Just take your cats out and use a very large chisel to destroy the cells . Many have done it on GTR , Supra's and I believe the Singapore member has done it aswell.

Catt'ed Dp will let more flow through yet keep the engine light under control and fall under emissions level in certain countries .

[C5driver]

I've heard that the decatted DPs don't create enough back pressure, so there's excessive waste gate chatter from the turbos. Any experience with this?

[AstonMartian777]

Originally Posted by C5driver

I've heard that the decatted DPs don't create enough back pressure, so there's excessive waste gate chatter from the turbos. Any experience with this?

You don't need no back pressure if you're running higher boost

[EuroKar]

Originally Posted by AstonMartian777

You don't need no back pressure if you're running higher boost

What about the engine control module seeing that the oxygen sensors are receiving too much of a reading due to no cats and the computer backs everything down as it is programmed to do.
BMS is not resolving that issue. Upping the boost does not fix that either.

A catlless exhaust system performs lower on a dyno then a engine with a stock exhaust. Seen it done back to back many times

[AstonMartian777]

Originally Posted by EuroKar

What about the engine control module seeing that the oxygen sensors are receiving too much of a reading due to no cats and the computer backs everything down as it is programmed to do.
BMS is not resolving that issue. Upping the boost does not fix that either.

A catlless exhaust system performs lower on a dyno then a engine with a stock exhaust. Seen it done back to back many times

It needs time to adopt

[m6beast]

Originally Posted by AstonMartian777

It needs time to adopt

+1
Adaptation is the key!
When I cut my muffler off the car had no power like I lost 4 cylinders. If I would have dynoed the same day it would have shown loss if power tremendously.

After the car adapted it was a beast
Full torque and in 1000rpm sooner and power across the board.

Same with catless DP power across the board and coming in earlier. Test need to be taken at least after a week to make sur car has adapted fully especially for a change like that.

Making some catless DP right now and hoping to take care if the cel using my M5 as test mule hopefully will work like my past cars

Once I have ready for install will Dyno before and after adaptation

[C's Bimmer]

Originally Posted by bigbrian

Careful with that +5 my man... Personally I would run a bit of race fuel (110 or 112) mixed in the tank with that setting just for "insurance" if you know what I mean.

Brian

I'm running 100 octane all the time now.

[C's Bimmer]

Originally Posted by AstonMartian777

you will barely get any results, whatever he is feeling, it's just in his head, and the price of catted after market dp is over 2k, that why in my opinion.

I completely disagree. Huge difference. 400 cell vs 200 cell is without a doubt much better. I also got mine used, so they were actually cheaper than catless DP's.

[Andym3100k]

Originally Posted by michel lane

Just take your cats out and use a very large chisel to destroy the cells . Many have done it on GTR , Supra's and I believe the Singapore member has done it aswell.

Catt'ed Dp will let more flow through yet keep the engine light under control and fall under emissions level in certain countries .

Yes I did the remove of ceramic cat in the stock DP, results is day n night. The turbo spool way much faster n if u install a micro cat on the bung u will not get the CEL light.

But now I'm using SS catless DP n got the CEL light even with 2 extended micro CATTED bung.

[bigbrian]

Anything that flows better is going to yield better performance. I would have to see for myself a Dyno run with OEM catted vs Catless to truly believe the catless loses power.

Brian

[EuroKar]

Originally Posted by bigbrian

Anything that flows better is going to yield better performance. I would have to see for myself a Dyno run with OEM catted vs Catless to truly believe the catless loses power.

Brian

I am trying to find the dyno sheet to show this.
M6 Gran Coupe with GT Haus full catless exhaust system with no tune VS M6 Coupe completely stock.
Both are forum members here.
The stock M6 out performed the Gran Coupe back to back dyno runs. Same dyno, operator, fuel, etc..

LSM is the forum member with the stock M6 coupe. He made a post on here and its somewhere back in the list.
His posts even states that we went with the Gran Coupe and he posted the numbers for everyone to see.
It didn't blow it out of the water insanely but it was enough to think twice about spending thousands of $$$$
Now, I love aftermarket exhaust just like the next guy. Just my opinion on dyno results of the current topic

[C's Bimmer]

Originally Posted by bigbrian

Anything that flows better is going to yield better performance.

100% agree. Is it as good as catless? Of course not, but once you compare the 2 downpipes (OEM vs Catted) and have them side by side and look at the cats themselves, it's so obvious that the AMS catted DP's flow better than OEM.