[clairvoyant]

How tricky is it to install O2 sensor simulator?
Or is it something that can be "reprogrammed onto the ECU"?

Thank You

Originally Posted by epiphone3

people sell O2 simulators that basically simulate the signal from an O2 sensor that is providing the correct numbers to the engine computer. This tricks the computer into thinking that the emissions values being read are correct and you therefore, in theory, don't get a check engine light.

[audiprotein]

Unplug o2 sensor, plug back in it's simulator.
If you find someone who can reflash your ecu that would be prolly the best choice, but here in Chicagoland we havent found anyone yet.

[clairvoyant]

Well here is my dilemma If I decide to grab that exhaust system and install it:

1. If they fit just fine and everything is working just fine....

2. If they don't fit and welding and cutting required...

3. If they don't fit and welding, cutting required on top of mysterious check engine light error...


What do you think folks? I want to be sure before I commit. Once cutting/welding is done, there is no going back.

Thank You

[BeMyWife330i]

Originally Posted by clairvoyant

Well here is my dilemma If I decide to grab that exhaust system and install it:

1. If they fit just fine and everything is working just fine....

2. If they don't fit and welding and cutting required...

3. If they don't fit and welding, cutting required on top of mysterious check engine light error...


What do you think folks? I want to be sure before I commit. Once cutting/welding is done, there is no going back.

Thank You

im sorry what model are you driving again?

[clairvoyant]

I drive a 2006 Euro E90 325i. If you read a different thread in this forum, I upgraded the ECU on my car from the Canadian 323i to the Euro 325i specs.
The wheelbases of 323i, 325i,
328i, 330i and 335i are all the same 108.70 inches, so there should not be a reason that Supersprint headers and cats need cutting and welding but I could be wrong.
Also the Euro E90 325i, E90 US 325i and the US 330i share the same part numbers on headers and cats based on www.realoem.com.

Originally Posted by BeMyWife330i

im sorry what model are you driving again?

[epiphone3]

Originally Posted by clairvoyant

I drive a 2006 Euro E90 325i. If you read a different thread in this forum, I upgraded the ECU on my car from the Canadian 323i to the Euro 325i specs.
The wheelbases of 323i, 325i,
328i, 330i and 335i are all the same 108.70 inches, so there should not be a reason that Supersprint headers and cats need cutting and welding but I could be wrong.
Also the Euro E90 325i, E90 US 325i and the US 330i share the same part numbers on headers and cats based on www.realoem.com.

according to the header should fit for sure. I think the header works with the stock center section too... not totally sure though.

[clairvoyant]

According to Mr. Will Turner headers and cat pipes are two Inseparable entities.
If you modify the headers without the cat pipes or vice versa; you won't gain anything. Is this true?

Originally Posted by epiphone3

according to the header should fit for sure. I think the header works with the stock center section too... not totally sure though.

[LACA335i]

TURBO DOnt have Header.. They have downpip. The exhaust manifold and dp is in 1 piece. 3 of each dp.

[audiprotein]

Originally Posted by LACA335i

TURBO DOnt have Header.. They have downpip. The exhaust manifold and dp is in 1 piece. 3 of each dp.

LOL not everyone here got 335's ))

[audiprotein]

Originally Posted by clairvoyant

According to Mr. Will Turner headers and cat pipes are two Inseparable entities.
If you modify the headers without the cat pipes or vice versa; you won't gain anything. Is this true?

You mean if you leave the secondary cats, right?
Maybe you wont gain as much, as with full exhaust, BUT you will def. gain louder sound and maybe a couple of hp.
Your car will feel like it pulls more on a higher speeds.
And yes, if u got a i6 (e90x) those headers should fit.

[epiphone3]

Originally Posted by audiprotein

You mean if you leave the secondary cats, right?
Maybe you wont gain as much, as with full exhaust, BUT you will def. gain louder sound and maybe a couple of hp.
Your car will feel like it pulls more on a higher speeds.
And yes, if u got a i6 (e90x) those headers should fit.

The headers should fit.

To Clairvoyant, the exhaust is setup such that there are two pairs of catalysts (4 total). Two cats per 3 cylinders. Turner is referring to the first pair of cats, or pre-cats, which are fixed within the stock exhaust manifold, or header, if you will. Those cats are one with the stock exhaust manifolds. Downstream of this, there are mid pipes (just straight pipes) leading to the second set of catalysts. So in short, one set of cats is permanantly mated to the stock header and one set is connected to the midpipes under the car.

THE BIGGEST GAIN you will get out of the exhaust on these cars is from eliminating the first set of cats, or pre-cats. On M-cars, this typically gains 10% torque across the entire rev-band and 10% more horsepower up top. On our cars, moving to a header from the stock manifolds with correct software tuning should accomplish a similar gain in horsepower. That is to say, a Euro 325i with 184 ft-lbs torque should end up with rougly 202 ft-lbs peak torque and with 235 hp up top, roughly. This is assuming that the secondary catalysts are not overly restricting in which case gains would be a bit less. Fitting a set of highflow secondary cats would pretty well guarantee the gains mentioned above.

[clairvoyant]

Refer to the diagram, which part are you talking about from your previous response? Thank you

Originally Posted by epiphone3

The headers should fit.
To Clairvoyant, the exhaust is setup such that there are two pairs of catalysts (4 total). Two cats per 3 cylinders. Turner is referring to the first pair of cats, or pre-cats, which are fixed within the stock exhaust manifold, or header, if you will. Those cats are one with the stock exhaust manifolds. Downstream of this, there are mid pipes (just straight pipes) leading to the second set of catalysts. So in short, one set of cats is permanantly mated to the stock header and one set is connected to the midpipes under the car.

THE BIGGEST GAIN you will get out of the exhaust on these cars is from eliminating the first set of cats, or pre-cats. On M-cars, this typically gains 10% torque across the entire rev-band and 10% more horsepower up top. On our cars, moving to a header from the stock manifolds with correct software tuning should accomplish a similar gain in horsepower. That is to say, a Euro 325i with 184 ft-lbs torque should end up with rougly 202 ft-lbs peak torque and with 235 hp up top, roughly. This is assuming that the secondary catalysts are not overly restricting in which case gains would be a bit less. Fitting a set of highflow secondary cats would pretty well guarantee the gains mentioned above.

[epiphone3]

Originally Posted by clairvoyant

Refer to the diagram, which part are you talking about from your previous response? Thank you

Part #1 is the header. On the stock car, this is an exhaust manifold with fixed pre-cats or primary catalysts.

Part #2 is the mid pipe section I refer to containing the secondary catalysts at the downstream end.

[clairvoyant]

Would you say to avoid any welding and cutting or possible check
engine light errors; I should replace the entire exhaust system (as
illustrated in the picture)?

Originally Posted by epiphone3

Part #1 is the header. On the stock car, this is an exhaust manifold with fixed pre-cats or primary catalysts.

Part #2 is the mid pipe section I refer to containing the secondary catalysts at the downstream end.

[PAKMAN]

Originally Posted by clairvoyant

Would you say to avoid any welding and cutting or possible check
engine light errors; I should replace the entire exhaust system (as
illustrated in the picture)?

for 1 and 2 no welding is necessary. they are bolt on.

[clairvoyant]

...but for Part 2 to the whatever OEM parts, welding or cutting will be required, right????

Originally Posted by PAKMAN

for 1 and 2 no welding is necessary. they are bolt on.

[epiphone3]

Originally Posted by clairvoyant

...but for Part 2 to the whatever OEM parts, welding or cutting will be required, right????

Part 2 going to Stock-version of Part 3 may require some cutting/welding to fit together.

To avoid check engine lights, you need to just handle to O2 sensor situation. I would probably just get O2 sims rather than trying to extend the ones from the primary cat to the secondary.

[clairvoyant]

Cutting, welding, & check engine light errors =

If I get the entire set (part 3 & 4); will Cutting, welding, & check engine light errors be issues?
I figure I'll go ahead and secure part 1 & 2 from that salvage/impound and wait until some fools with [undammaged] Supersprint exhausts wreck their cars.

Off course my other concerns:
1.) How noisy and ricey will the entire exhaust system be?
2.) Will I past the Ontario emission test?

[epiphone3]

Originally Posted by clairvoyant

Cutting, welding, & check engine light errors =

If I get the entire set (part 3 & 4); will Cutting, welding, & check engine light errors be issues?
I figure I'll go ahead and secure part 1 & 2 from that salvage/impound and wait until some fools with [undammaged] Supersprint exhausts wreck their cars.

Off course my other concerns:
1.) How noisy and ricey will the entire exhaust system be?
2.) Will I past the Ontario emission test?

You shouldn't get CELs if you run O2 simms for the primary cat o2 sensors. You might get CELs if you extend the O2 sensors for the primary cat down to the secondary.

If you got the full system, it would be louder than stock for sure. How much I don't know... my buddy has an M3 with a Super Sprint muffler and it didn't get crazy loud. With Supersprint, it won't be ricey.

With regards to passing emissions, my guess is that you would still pass with the full system as you still have the metallic cats from the Super Sprint system. However, I don't know if there are any guarantees for this.

Have you tried discussing any of this with SuperSprint themselves? Ask them how to avoid CEL codes with their exhaust. Ask them if, with the full system, you would likely pass emissions. Ask them if the system is street legal. Ask them if their headers would bolt up the stock exhaust system (Part 1 supersprint, rest stock).