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Discussion Starter #1
Just had the Fabspeed pipes installed this past week.

Substantially louder, more popping, and much smoother shifts now. I have to say I am pleased with the preliminary outcome.

Installer did advise though that they were unable to re-install a screen that was behind either the secondary cats or pipes. I think it is a guard to protect the bell housing. Anyone have this similar issue? I am thinking maybe this screen is no longer necessary anyways.
 

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Discussion Starter #3
I am going to also have the K&N Air Filter installed to give to sides the increased breathing.

I can't say for sure if there are power gains, but the shifting is much smoother. I am however concerned that the new pipe is right up against the bell housing. There may be a vibration issue, but so far its ok.
 

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can you provide a few photos?
I am currently running a BMC filter from FD and it is fantastic also have the Quicksilver sports exhaust on the car planning on the Fabspeed pipes and the Larini resonator delete as the next mods
 

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Discussion Starter #5
I will try and take some decent pictures and post.

I meant to say BMC filter. That is the one they recommend.
 

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I see that lower heat shield is gone...I wouldnt sweat that though all mine ever does is catch and cook small woodland creatures which makes my husky constantly try and get under my car to eat them

your cats may benefit from the extra airflow...if not you can always notch that lower tray...have you noticed any clearance issues yet with the non squashed pipes going under your steering rack?
 

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Discussion Starter #9
No clearance issues yet and have gone up and down some driveway aprons. The car does sit pretty high. I think its a good 1/2 inch higher than the mercedes sl500 so im not expecting any problems.

I haven't heard of any cat damage issues. The trofero has a similar setup with the difference being straight pipe from the resonator back.

I will try and make a sound clip when it stops raining.
 

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You can run without the mesh guard with little problems. It's there just in case of a bad accident or a serious misstep. You have more clearance without it, you're just taking a bit more risk if you do run over a curb... in which case your insurance will kick in and probably be a non-issue to you.
 

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Here's something to consider. It has long been my understanding that popping on deceleration is indicative of a lean running engine. Consider that if you increase airflow through the engine with exhaust and intake mods without adjusting the fuel delivery, you have created a lean running engine. You need the injector programming adjusted, if not larger injectors and uprated fuel pump. If you change one thing in an engine, you have to change other things. Running lean is certainly better than running rich and conducive to performance..... to a point. Too lean and you have "issues".

It would be interesting to examine the spark plugs after some miles for confirmation of the lean condition.

Do you feel "lean surge" at steady mid-RPM cruising?
 

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The whole point of the MAF and Lambda sensors are to adjust the mixture as necessary so not sure why the injectors would need adjusting?

The pops are down to the way the exhaust gas flow changes - or running rich without a cat so unburnt fuel detonates.
 

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Discussion Starter #13
Here's something to consider. It has long been my understanding that popping on deceleration is indicative of a lean running engine. Consider that if you increase airflow through the engine with exhaust and intake mods without adjusting the fuel delivery, you have created a lean running engine. You need the injector programming adjusted, if not larger injectors and uprated fuel pump. If you change one thing in an engine, you have to change other things. Running lean is certainly better than running rich and conducive to performance..... to a point. Too lean and you have "issues".

It would be interesting to examine the spark plugs after some miles for confirmation of the lean condition.

Do you feel "lean surge" at steady mid-RPM cruising?

Good points. I am scheduled for a routine maintenance at the dealer so they may tune as necessary.

I am not familiar with the term "lean surge" Only noticable difference during acceleration is much smoother shifts. nothing has really changed, that Im aware of, during normal cruising.

Another point I'd like to mention is that at any time if you find yourself in need of quick silence, simply shifting into neutral or a higher gear and feathering the gas will provide a very quiet exhaust note. I bring this up because an officer was behind me yesterday and I went into silent mode.
It was no problem.
 

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Discussion Starter #14
You can run without the mesh guard with little problems. It's there just in case of a bad accident or a serious misstep. You have more clearance without it, you're just taking a bit more risk if you do run over a curb... in which case your insurance will kick in and probably be a non-issue to you.
Thanks for the clarification. I was wondering about the function of that screen.
 

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Changes of this nature to our exhaust systems will cause a lean condition to your fuel mixture. MAF and Lambda can correct some amount of it. If you've changed your exhaust quite a bit, our performance chip will allow you to richen the mixture back up, this is something the dealer can't do with the tools they have.

What Fast Freddy said is true, if you make a change and want the system to run correctly, you need to make a change somewhere else. We have the ability to make a range of adjustments with the factory ECU to compensate for these changes, while your factory program wasn't designed with those changes in mind.

Fuel Pumps and Injectors should not be required unless you're making a huge change such as forced induction.
 

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screen adapters should have been included

Just had the Fabspeed pipes installed this past week.

Substantially louder, more popping, and much smoother shifts now. I have to say I am pleased with the preliminary outcome.

Installer did advise though that they were unable to re-install a screen that was behind either the secondary cats or pipes. I think it is a guard to protect the bell housing. Anyone have this similar issue? I am thinking maybe this screen is no longer necessary anyways.
your order should have included two small adapters to drop your screen at the rear mounting point about an inch lower. My car was used as the test fitment for this system and saw it installed on the lift.





you can see that the low point lowers by about 2" total to allow the cat bypass pipe to go around the steering rack without a major flatspot in the middle (see my previous post with both systems side by side). Since this is right in line with the center of the wheel, you still have plenty of ground clearance as long as you go over somewthing with the wheels, only potential problem would be running over something that fit between the tires like a large rock, that might hit the screen (although from looking at the front of the car, would most likely also hit the front airdam)
 

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can you post a Youtube for the results?
 

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Max. I believe the Larini's dont replate THOSE cats. They replace the ones at the Xpipe... These are right after the manifolds.
 
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