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From Sat Jul 22 00:16:40 2000
Sat, 22 Jul 2000 00:16:40 -0700
From: Dale Beuning <>
Sat, 22 Jul 2000 00:16:39 -0700 (PDT)
Subject: Re: E36 stock 4 cat converter exhaust
To: (Dom)
Date: Sat, 22 Jul 2000 00:16:38 -0700 (PDT)
Cc: ()

The easiest and best approach is to buy one of the dozen aftermarket bolt-on exhaust systems available Dinan/UUC/ActiveAutowerke/ES Tuning/B&B/ SuperSprint/etc. The Active Autowerke seems to be one of the most popular right now.

Under NO circumstances would I mess with the catalytic converters. Let me say that again, even if these guys can weld up an exhaust for you, do NOT let them touch the cat converters. You are asking for expensive trouble if you do that.

I wouldn't worry too much about that little vacuum actuated valve, it helps low-end torque, but if an aftermarket system doesn't allow it to be installed, I wouldn't sweat it.


> Hi Carl, I have some question regarding E36 exhaust. I have been trying to
> get answer elsewhere but seems no one is interested in answering. So I
> decided to bug you. Sorry about that .....
> I was about to get a mandrel bend 2.5" pipe for my 97 328is. When the car
> is jacked up, holly, the stock exhaust is a 2 pipes system (I can't see the
> header) going from the engine/header to the end, while each pipe has 2 cat.
> converters, there are a total of 4 cat coverters !! PLUS that electronic
> "valve" at the end of one of the pipe.
> The exhaust shop suggest me to cut both the stock pipe right at the
> beginning of the 1st cat. converters and then replace with a single hi-flow
> cat. converter and then go straight out to the muffler. (Take out that
> electronic valve too)
> I wonder what is the use/impect of taking out that valve and do you have
> any suggestion how should I mod the exhaust ? Or should I just buy one of
> those after market bolt on (HKS, SuperSprint etc) system?
> thanks for your help.
> Dom


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