Exhaust: Do we really need back pressure?

[boston813roc at gmail.com (brad boston)]

If you are running a 2.5 inch pipe from the headers back with no turbo you
will need to richen up the air fuel mixture a bit from stock.

Also, a straight through muffler/resonator (if correctly tuned) will cause
back pressure due to the resonating pressure waves bouncing around inside
the resonator

Brad

On 2/15/07, Cory Langford <Cory_Langford@bcit.ca> wrote:
>
>
>
> Just finalizing the exhaust set-up and I was wondering what the opinion
> was
> on running a completely free flow exhaust.
>
> One of the tracks has a noise restriction, and one does not.  So I figured
> the simplest design was from the header to 2.5 inch pipe straight back (no
> cat, res. etc).  I figured I would have a removable muffler that can slide
> in when needed, and a straight pipe when not.
>
> But I have seen some talk on the vw engines needing some back pressure to
> keep the exhaust gasses hot enough to travel quickly through to the end.
> So I was wondering if a simple straight pipe would have any down sides to
> it (beside noise)?
>
> Cory
>
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