Kleemann headers + Pipes are way too loud? - Mercedes Benz SLK Forum

Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 03-13-2017
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Kleemann headers + Pipes are way too loud?

Hey guys,

I`ve just installed a pair of new Kleemann Headers with catless downpipes and X-pipe.
I noticed an improvement in performance, will check the changes on a dyno in a couple days, but I am not sure if I am happy with it or not.

Previously I had second cats and resonator removed, kept the 1st cats and fitted an X-Pipe. It was just right sounding, loud enough and with mellow burbling tone even revving high.

Now it is incredibly loud and have a trumphet kind of sound when floored. I know it still sounds amazing, but I am not sure if like being a nuisance for all the people around by having such a roaring monster.

I used to rev the engine using it everyday, I used to like to go a couple gears down and give it a pedal to the metal. But now I am driving much less manically trying to keep the revs below 3000.

What do you think, guys? Have anyone been through such a feeling? Should I try to get used to it?
If no, could installing a stock reso make it quieter but to keep the performance figures?
It is not the drone I don`t like, it is the actual beastly sound that scares a hell of me and people around

Here is the new video. In real life it is much much louder.

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#2 Old 03-13-2017
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That sound is not too loud at all

Mine is louder cause of my Supercharger
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#3 Old 03-13-2017
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Ah well.... guess you'll have to move this one to "Things you don't like about your R171".
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#4 Old 03-13-2017
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Sounds great, maybe you'll learn to love it?! Is it your daily driver?


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#5 Old 03-13-2017
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Hi All


I had almost the same mod as you but I have kept the rear CATs , check my sig for the cold start , Yes its louder than Xpipes & two CATs , I had the Xpipe mod to start with but kept all four CATs so I could have the header mod & keep two CATs . No one has told me its too loud yet but at some point I'm sure some one will , I wanted the low burbling of the V8 & this is what this mod give me . You could go back & have the centre box put back in ??


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#6 Old 03-14-2017
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I am trying to get used to it now. I will give it a chance for a couple weeks. If no - I will put a resonator back or a pair of high flow cats.

By the way guys, I could not manage to find the numbers there on the board, and to not to create another topic I would ask if somebody had tested actual 0-62 acceleration times after such performance mods as headers+decat+ECU tune? It should result in about 395-ish BHP, which should be around 4.5-4.6 seconds, am I wrong?
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#7 Old 03-14-2017
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Hi All


Yes mine was dyno at about the same 397bhp but that was with normal OEM air filters , I now have Greens air filters installed so i'm hoping its just dropped over the 400 mark .


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#8 Old 03-15-2017
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Quote:
Originally Posted by ZeroZero View Post
Hi All


Yes mine was dyno at about the same 397bhp but that was with normal OEM air filters , I now have Greens air filters installed so i'm hoping its just dropped over the 400 mark .


Cheers


Andy
Thanks Andy, but what about 0-62 time, did it become faster in actual numbers? Because an SLK 55 AMG R172 has about 415 HP and its 0-62 time is about 4.2 - 4.4 sec. If you have nearly the same amount of power, identical transmission and chassis, r171 rime should be close to r172.
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#9 Old 03-15-2017
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Quote:
Originally Posted by Redmon Hangslow View Post
Thanks Andy, but what about 0-62 time, did it become faster in actual numbers? Because an SLK 55 AMG R172 has about 415 HP and its 0-62 time is about 4.2 - 4.4 sec. If you have nearly the same amount of power, identical transmission and chassis, r171 rime should be close to r172.
rime = time
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#10 Old 03-15-2017
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Mercedes 4.9 seconds time is considered very conservative. There have been examples of 4.2 seconds being recorded with a standard spec car.
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#11 Old 03-15-2017
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Originally Posted by davest4s View Post
Mercedes 4.9 seconds time is considered very conservative. There have been examples of 4.2 seconds being recorded with a standard spec car.
I measured stock time 0-62 using racelogic last year and it was straight 4.9. After the header mod my car feels much quicker. I will measure the dynamics again for sure, but I wonder if there are user proven data exists.
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#12 Old 03-15-2017
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Quote:
Originally Posted by Redmon Hangslow View Post
I measured stock time 0-62 using racelogic last year and it was straight 4.9. After the header mod my car feels much quicker. I will measure the dynamics again for sure, but I wonder if there are user proven data exists.
A quick Google came up with Car and Driver getting 4.3.

Can't remember who did 4.2, I thought it was a mag or TV programme?

Hopefully someone else will remember


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#13 Old 03-15-2017
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#14 Old 03-16-2017
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Did ECU Tune today, the dyno showed 390 BHP and 600 Nm torque which is quite nice for a N/A engine. Will measure 0-62 time in few weeks when it will be little warmer outside.
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#15 Old 03-16-2017
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fyi for newbies
N/A does not mean not applicable or not authorized but normally aspirated


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#16 Old 04-17-2017
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Getting my Headers and ECU done next week and I hope it sounds that loud
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#17 Old 04-18-2017
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Strange, the Kleemann website says that Headers + Downpipe + ECU gives around 415hp, I guess that`s why they wrote `up to 415hp`. It could be 361 or 415.. marketing...
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#18 Old 04-18-2017
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Strange, the Kleemann website says that Headers + Downpipe + ECU gives around 415hp, I guess that`s why they wrote `up to 415hp`. It could be 361 or 415.. marketing...
oem stock 360 hp + 25 hp for tune + 25 hp for headers = 410 hp approx

what's 5 hp among friends
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#19 Old 04-18-2017
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oem stock 360 hp + 25 hp for tune + 25 hp for headers = 410 hp approx

what's 5 hp among friends
5hp for a N/A engine is everything, Jeff! everything!! hahaha joking.

It seems a lot of us are going down the headers + downpipe lane, I'm hoping to install mine soon too and I hope it's louder.
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I love my sound Sc + Headers + tune

https://www.slkworld.com/driving-stor...-than-you.html
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