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      11-15-2013, 01:11 AM   #45
Asbjorn
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Quote:
Originally Posted by VailM3 View Post
Any videos of the sound?
Both OP and I posted videos of the sound in this thread.

I do not think you will need the "gold tree" mod or 35is mufflers if you delete the secondary cats. The flap helps to dampen the exhaust when just cruising, and if you are like me, you will want that after the secondary cat delete. There is a reason BMW installed it in the first place.
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      02-09-2014, 09:35 PM   #46
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Another sound clip from driving in a tunnel with one window open

http://v.youku.com/v_show/id_XNjcxMTY3NzEy.html

The up-shifts sound like small explosions haha
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      10-01-2014, 04:02 PM   #47
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Why I can't use the OEM clamp of the old pipe instead of buy new OEM clamp?

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Originally Posted by Asbjorn View Post
Before and after pics attached. We found that miltek had forgotten to ship the small clamp that replaces the oem clamp because the pipes are larger. Also the "professionals" cut the OEM pipes at the wrong place at first and had to weld things back together again. So learn this: The OEM and milktek pipes are of the same diameter where the ends are to meet. You cannot slide one inside the other.........

Anyhow, everything is fine now, and first impressions are that at idle, or while cruising in D/normal and barely touching the throttle, the car is almost as quiet as before. So if you worry that this mod will take away too much comfort for long distance traveling etc, I do not think you have to.

The car is however significantly louder when you start pushing it, and all the pops and "burbles" are much easier to hear now as well. It seems I can now also better control when people turn their heads - my right foot is very delighted.

Update: Cold starts in my basement parking lot sound like small explosions now - it makes the car seem very masculine indeed! Also I am constantly finding myself speeding just to listen to that nice sound. Even with the top up, the sound is very addicting. I like it very much.
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      10-02-2014, 03:58 AM   #48
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Quote:
Originally Posted by giovannm View Post
Why I can't use the OEM clamp of the old pipe instead of buy new OEM clamp?
They aren't there. You have to cut the pipes, otherwise it is just one long pipe going all the way to the downpipe. The drawing on realoem is misleading. I guess they only use it for when the cats need replacement.
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      10-04-2014, 04:46 PM   #49
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Hi, it's still available? If yes, what's the price, and possibility to ship to Italy?

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Originally Posted by Lambobimmer View Post
If anyone is interested I have this mod and never installed it. So, I have brand new and never installed left and right Milltek cat delete pipes.
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      11-05-2014, 05:01 PM   #50
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Quote:
Originally Posted by javol View Post
In the N54 engine, the 2 primary cats are part of the downpipes, hence are practically located at 15-20 cm from the turbos. They are the most effective in reducing emissions and the most restrictive in term of exhaust flow, quitting power and torque. Removing the primary cats gan give you aprox 20-30 whp, depending on the chip tuning you run, and less turbo lag. The secondary cats are located aprox in the center of the car, welded to the midpipes. Removing them does NOT improve power and torque nor reduce turbo lag. Probably the emissions increase and it depends on how much severe are the laws where you live to go with this mod or not. For what concern the Z4 35i, I think this is the best mod to have a louder sound and an amplified upshift "TUM" @ very low cost, at least in Italy.
Hello javol, I'm Italian can I contact you by phone?
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