[Tjalle]

Finally!

Today I got confirmation that my Klappen.. is safe in BMW spare parts network - heading for Sweden.

This could be a Merry Christmas...

[Tjalle]

I have just painted my covers for exhaust outlets in antracite grey metallic.

Installation on Wed.

[Tjalle]

Short report after installation today.

Sport= legal Track= non-legal. Engine is STD 35i.

Exterior sound is even better than in Russian video:
Sport has moderate loudness with overtones of high pitch sound. Like 400+ bhp.
Track has strong sound with blend of "gurgles" and high pitch sound. Like 500+bhp

That alone "pays" for the investment

Interior sound is currently problematic to evaluate - I ordered system 10 weeks ago - since then winter has arrived in Sweden - I have new studded tires with a fair amount of studs and fairly long studs= much roadnoise.

I could hardly hear exhaust sound in Sport - other than a bit of rumble- like STD, but a bit more so. During acceleration engine sound was more obvious.

Cruising in Track gave a heavier rumble - but no significant exhaust sound.

Acceleration/high revs in Track gave significant exhaust sound, similar to exterior sound, and put a smile on my face!!

I will get back after more driving, but can not give final evaluation until summertires.

I will take pics ASAP.

Developer/supplier of exhaust is Red Arch Engineering/Manufacturing of central UK= Midlands.
Midlands happens to be the area where about 80% of all Formula 1 cars are being developed and manufactured AND 80% of all F1 components.

[SANK_CH]

Congrats Tjalle.

it came just on time for Xmas.

[Tjalle]

Sank: yes it made my day!

[Tjalle]

Pictures.

Sorry for wintertires - summertires are much more impressiv - especially from behind - 20" staggered.

[SANK_CH]

Congrats Tjalle,

it looks awesome.

[Tjalle]

Sank: Thanks! I am very happy with it.

My only problem is roadnoise with studded tires - we just got our first snow.
I "need" to use Track mode to hear sound from exhaust. I am waiting for spring, when I, hopefully, can hear exhaust sound even in "Sport" - it usually does not pay off to drive illegal regularily.

I wrote to the developer/supplier: Red Arch Eng./Manuf. in the UK, and asked for a scheme of the internal tubing/walls, but I got a nice mail back saying that they were unable to provide that for secrecy reasons. It is halfway bull - anybody can dismantle the muffler - but they must be careful not to anger BMW.

[Scandic24]

Originally Posted by Tjalle

Sank: Thanks! I am very happy with it.

My only problem is roadnoise with studded tires - we just got our first snow.
I "need" to use Track mode to hear sound from exhaust. I am waiting for spring, when I, hopefully, can hear exhaust sound even in "Sport" - it usually does not pay off to drive illegal regularily.

You live on Orust, why didn't you buy non-studded winter tires (friktionsdäck)?

[Tjalle]

I have it on my 9000. X4 is for snow and skiing in north of Sweden- also driving on ice-tracks while up north. I did that last year - this year will be even more fun with the "500+bhp - sound"

[Scandic24]

Originally Posted by Tjalle

I have it on my 9000. X4 is for snow and skiing in north of Sweden- also driving on ice-tracks while up north. I did that last year - this year will be even more fun with the "500+bhp - sound"

I actually live up north with the snow and skiing you mention and I switched to non-studded tires a couple of years ago...never looked back. Silky smooth and just as good grip. Only difference; with studded tires you'll hear when you loose grip.

[lavasani]

Is this compatible with 20d m ?

[Tjalle]

lavasani.

Sorry - no! This is unique for X4 35i

[Tjalle]

Scandic. I disagree. I happen to have experience with most types of tires - including rally studded tires. On slippery ice - like what you- typically - have on an ice track, there is a significant difference - not to talk about rally studs .

I do agree that, for most times, even in north of Sweden there is marginal difference, but I wanted maximum grip for ice driving.

Since 9000 is very good on ice/snow- even with non-studded tires - I get away with it during most trips around home.

[Tjalle]

All threads about M40i- and Klappen exhausts together.

[FSociety]

Congrats!
Any video for us?
mge92 sounds more aggressive than M40i exhaust

[Tjalle]

ROBNYC, sorry I don`t do videos. There is a video of a Russian X4 with Klappen being dynotested in this thread. Check also 2:nd video, where you can listen to closed and open valves

[FSociety]

Originally Posted by Tjalle

ROBNYC, sorry I don`t do videos. There is a video of a Russian X4 with Klappen being dynotested in this thread. Check also 2:nd video, where you can listen to closed and open valves

Why no rev videos for us?
How do we know if this is better than the stock exhaust on M40i =D

Like before (X4 35i stock) and after (MPE) videos would be great for the whole forum.

[Tjalle]

ROBNYC, you have it all on this thread - the Russian car:
-video 1 - STD
-video 2 - Klappen - Sport and Track
-video 3 -Klappen being dynotested.

Do you think it is fake just because it is Russian? Mine has exactly the same sound

[FSociety]

Originally Posted by Tjalle

ROBNYC, you have it all on this thread - the Russian car:
-video 1 - STD
-video 2 - Klappen - Sport and Track
-video 3 -Klappen being dynotested.

Do you think it is fake just because it is Russian? Mine has exactly the same sound

thank you could you get more info if he has a tune, what octane rating?
370HP and 600Nm is pretty nice

[Tjalle]

ROBNYC, sorry video from You Tube, supplied by person from Poland. Note the "dark clouds" coming from exhausts att max. revs. Oil or fuel? I believe fuel to reduce exhaust temperatures - an old SAAB trick.

[Tjalle]

Guys, spring is in the air - time to plan for some upgrades.

SANK and ROBNYC are home free - they have ordered M40i and have to make do with its exhaust .

All others, with 35i, now is the time for some real joy of driving - listen to the Russian car and have a look at my installation in this thread.

I am longing for the moment when I can put on summertires - now sound is hampered by studded tires.