I want to buy a cutout for my 2003 525i, and I just wanted to double check that I had the outer diameter right before buying one. I measured the outer diameter of my exhaust at 2.5" inches. Please let me know if that's right. And does anyone know where near the battery I can get key on only constant power for it?
Ryan Kasko
Cars:
-2003 E39 525i with only 60k on the odometer!
Bought October, 2018
I have a QTP electric cutout on my 540.
Depending on where you put it the pipe could have a double wall.
I cut a hole in the dead leg of the Y resonator then welded on a short section of pipe and a flange for the cutout.
Yes I know my welds look like crap, that was the second time I used a TIG welder.
The intention was to run it back to the bumper for a dual exhaust setup that I haven't done yet.
Dual_5.JPG
Dual_7.JPG
Dual_11.JPG
Last edited by JimLev; 06-19-2019 at 02:55 PM.
The welds aren't horrible and I was planning on putting mine in a similar spot. What size cutout did you need to order?
Ryan Kasko
Cars:
-2003 E39 525i with only 60k on the odometer!
Bought October, 2018
Those welds are crap, at least they don't leak.
I used a 2 1/4" QTP, had to keep it on the small side, there isn't a lot of clearance under the car.
These are good TIG welds.
Header34.JPG
Last edited by JimLev; 06-20-2019 at 02:22 PM. Reason: Corrected the size, 2 1/4" not 2 1/8"
Jim that's one nice placement for that cutout, as the other branch that normally acts as the tailpipe would sort of take up the function of a resonator if you have a muffler in place. How does it feel with that cutout? Also, the valve you're using looks extra nice, as everthing in your car. Where did you get it?
Diehard E39 driver.
I'd rather die or take a walk before driving an E60 or any BMW made after Y2K.
"Your momma's so ugly she makes Bangle cars look nice"
JimLev what kind of sound do you get with the cutout at that location? I've been thinking of doing an electric cutout too.
Don't expect and seat of the pants gains, I did this as the beginning of a dual exhaust setup but as usual something else got in the way (LS3 '33 Ford build).
The left side has a nice small Vibrant dual tip muffler. I wasn't going to put a muffler on the right side, just some matching dual tips that I had that are now on the '33.
I corrected the post above, I used a 2 1/4" QTP, this one.
https://www.summitracing.com/parts/q...c225/overview/
I like that I can control how much it opens/closes to control the amount of deep tone from it at the low/mid RPM's.
With it full open at 5-6500 RPM it sounds more like a 12 cyl European car.
It's a pretty deep mellow tone unless you wind it out to redline.
I'll see if I can find a short clip of it.
25% open clip
https://1drv.ms/u/s!ApkTIzHhyMd5mBH2EymidsHS_85c
When it's 100% open it's louder and has a slight rasp only when cold if you goose it, it goes away after the 1st mile.
I think it's the internal perforated section in the resonator that you can see in the post 2 pic above.
The next time I have it apart I'll put a tack weld on it and the internal pipe so it won't vibrate.
Last edited by JimLev; 06-20-2019 at 04:18 PM. Reason: added link
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