BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      08-10-2009, 11:43 PM   #1
BI2016
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Inside Performance - Quad Exhaust Muffler

Hi Guys,

Im a pretty new member, and I have never posted anything on here before, however I feel obligated to warn members who were thinking of getting an Inside performance Quad system for their 135i - particularly a tuned one ( JB3 or Procede) to be wary of the modifications that need to be done to the muffler and tips in order for it to be suitable for the 135i.

This system was clearly made for ( and is 100% perfect for) the 125i, which clearly has far lower levels of flow comming out the exhaust than the twin turbo motor. Unfortunately when I was driving my 135i ( which has a V3 Rev 2 and an AFE intake) back home after having the system put on my car I noticed a "tornado-esque" noise comming from the rear pipes... after further inspection we realised that the noise was comming from the exhaust gas going into the muffler box and hitting the back of the tips ( which are not connected in this kit - think Lexus IS-F).

My car had to go back an have the rear boxes removed, and get new tips made so that you get a "straight through" effect from pipe to tip.

I feel potential buyers should be aware of this, as I was pretty upset and dissapointed ( after spending several grand, and waiting a long time for the muffler and CF diffuser to be made up) to find the car sounded more like a dyson on steroids than the silky smooth inline 6 sports car.

Beyond this obvious technical floor, the system looks great and is very factory looking ( which was why i preferred it to the Hartge system)... however after seeing the layout of the Hartge system, the is not set up like this, and would not give this problem.... and in hindsight its definitely the better system.

I hope this is of use to those who were tossing up between the two...

Kind Regards,

Brett
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      08-11-2009, 07:51 AM   #2
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you spent several grand on a catback & diffuser?

holy crap
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      08-11-2009, 09:40 AM   #3
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Quote:
Originally Posted by alpnwhite96 View Post
you spent several grand on a catback & diffuser?

holy crap
Almost all of the quads are this exspensive.
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2008 AW 135i, Whats a mod?
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      08-11-2009, 01:44 PM   #4
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So in summary: Hartge has a better system than Inside Performance
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      08-11-2009, 05:39 PM   #5
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Thanks Brett, for the warning. You probably saved fellow addicts a lot of frustration. They should not say it works on a car when it does not. Thanks again.
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      08-11-2009, 08:37 PM   #6
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Quote:
Originally Posted by WhiteOne View Post
Thanks Brett, for the warning. You probably saved fellow addicts a lot of frustration. They should not say it works on a car when it does not. Thanks again.
+1 thanks. I very nearly ordered one too. But after hearing this will be steering clear.
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      08-11-2009, 11:57 PM   #7
BI2016
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Yep unfortunately these systems are costly... even more reason to be wary.

I do agree that they should mention how unsuitable it is for the 135i.

Robert in Summary the Hartge system actually works
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      08-12-2009, 02:27 AM   #8
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+1 thank you for this information.

I already ordered that system 2 weeks ago! Can you please post some pictures of the details that you had to modify to avoid that noise?

I ordered that system on recommendation of some other forum members who already have this system installed and seem to be satisfied.

I hope to get an working version of it.

Wasn't it SLO who posted some information about this exhaust? I was not able to find the old topic..

Again: thanks for posting some information about the made changes - just to play safe
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      08-12-2009, 02:33 AM   #9
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Here's the thread. He seemed happy
I can see how the boxes would cause that sound though. Not straight thru at all.

http://www.1addicts.com/forums/showthread.php?t=285774
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      08-12-2009, 07:18 AM   #10
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Thanks for the warning Brett... I too was on the verge of ordering this system..

Probably better to just order the quad diffuser and have the axle back custom made in Oz.
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      11-02-2009, 10:33 AM   #11
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bump

how did the story end now?
how does the exhaust sound now?
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http://www.2addicts.com/forums/showthread.php?t=978070
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      02-15-2010, 06:40 PM   #12
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Just ran across this thread. Interesting. I have never heard the sound on mine...

Brett, can you please describe what you were hearing and when. It doesn't seem like mine has any restrictions pre or post muffler.
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      02-15-2010, 11:39 PM   #13
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+1
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