harkgar

http://www.stealthtdi.com/Performance.html

I have forgotten who asked for this article but here it is.

When a leak develops in my CDi system I shall put in a straight pipe too minus 2 mufflers.

Side pipe perhaps?

lxl_Jeffro_lxl

Thanks for posting this harkgar! I enjoyed the detailed info, that entire rpage appealed to me. I will probably end up chopping off the mufflers and resonators when I get the time. I have a friend who can bend me some stainless steel pipes for free =)

Green E-300 DT

What little if any gain you might achieve will be offset by droning at
various speeds, and IMHO will not be worth the bother.

One thing you must do is go back to the stock filter and ****can that K & N.

Leaving that thing in there is simply asking for trouble. Go over to Fred's and do a search and find out why.

Good luck.

harkgar

Yes. Cost me hundreds of dollars in my E55. The oil from the K & N can ruin the "hot wire" in the intake or whatever you call it. This is particularly bad if it is a "down-draught" type of filter in a V-formation engine.

240D 3.0T

Faster turbo spooling, maybe 1mpg difference and ~0.3seconds off the 0-60 time.

Green E-300 DT

In the newer cars such as the late ('98-'99) W-210s, and the even later W-211s?

What about the increases in the various noise levels?

I did remove the back muffler on my TDI wagon. It did seem like the car felt faster, but I cannot be sure.
The turbo seemed to spool up faster, but then again, I couldn't really be sure.

BTW, my '99 ran the 1/8 mile at Irwindale in 10 seconds flat at 70 mph.
It was stock except for a SpeedTuning program. Traction was a real problem.

Do you know if that program may have caused my tranny
to fail relatively early at approximately 128K miles?

Being in the business, I figured that you might know.

240D 3.0T

In any turbocharged car, removing the exhaust will make it spool faster. It increases the pressure differential between the exhaust manifold and the turbo outlet so more energy is used to spin the turbine.

Yes, it will be significantly louder. How loud depends on what you remove. Just the muffler will not do much, the resonator and cat(s) (on W210/211) do most of the silencing work.

Yes, the program likely helped it fail. Torque is the enemy of long automatic tranny life. It also depends on maintenance. If you changed the fluid every 30k miles, it was indeed an early death. If you followed the "filled for life" fluid idea, then ~100k miles is about it's lifespan.

Green E-300 DT

Thanks for the information.

It figures! I bought the car Certified used with 82K miles.
I suspected that the original owner never did any maintenance to speak of including regularly changing the engine oil.
Compression leakdown tests showed pretty wide differnces between cylinders, and it idled roughly.
However, with regular synthetic oil changes, I think the compression rings freed up and sealed better and the power output improved and the rough idle disappeared.

The trans was 'worked on' by Fletcher at 99K miles. The T/C was changed along with the tranny computer and the filter and of course the fluid, but it still had no T/C lockup, and I would guess that the 'neglect' up to that point had already done its' damage. No wonder the trans went South!

What about driving it most all the time (easy) using the second gear start feature and allowing it to upshift early to take advantage of the low rpm torque. Does that harm the trans?

Thanks again.

harkgar

My 2006 CDi has only one catalytic converter straight after the turbo and no resonators. There are 2 mufflers at the level of the rear bumper. Thats all. There is not a lot for me to cut unless I chop the pipe off somewhere between the front and rear seats, before the large diameter pipe splits into 2.

The car is very quiet though.