[Vwdiesel] 2.5

Thu Aug 4 09:49:39 PDT 2011

Not trying to be snotty,but why would you put an K&N air filter in a VW 
(or much of anything else for that matter)???

I assume you believe their advertising - which is pure BS.  There is a 
mountain of experience with many vehicles that shows these things do 
precious little to remove anything smaller than a turkey from the 
airstream and don't really flow all that well.  Don't know about 
MkIII, but for MkIV, the stock airbox and filter will handle WAY more 
air than the engine needs to at least 200HP and filter properly.  
Since you live in paradise, if you stick to the main roads it won't be 
that much of a problem, but if you ever go near any dirt of any kind, 
you will be removing it from the air with your engine, not the air 
cleaner. 

On Thu, 4 Aug 2011 09:17:12 -0700, Gerry Wolfe wrote:
I have a '97 Jetta with TDI. Replaced the stock with 2.5" all the way thru,
> no cat, Flowmaster muffler with a simple downbend at the end. 
> You can hardly hear it at idle outside the car, and only hear exhaust noise
> inside on hard acceleration or climbing a hill (lots of those on Vancouver
> Island!). 
> I did not notice any performance or economy change except that the turbo
> does seem to spool up quicker. 
> Also replaced the air filter with a K&N. 
>
> Rgds, g. 
>
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
> Behalf Of James Hansen
> Sent: Thursday, August 04, 2011 8:40 AM
> To: 'mikitka'; vwdiesel at vwfans.com
> Subject: Re: [Vwdiesel] Caddy Exhaust
>
> It isn't loud at all, except when the whole setup hits the resonance
> frequencies. If you are lucky and win the resonance lottery, the car
> interior throbs in the most annoying fashion right at cruising speed, and it
> raps out the tailpipe at that point pretty impressively. Quite the neat
> deal. 
> I would highly recommend a muffler at some point, to reduce the resonance
> only. I have a single flowmaster at the rear stock location on the 97
> Passat. All you hear is whistle when on load, and no resonance at any
> point. It's perfect in my opinion. 
> Stock non turbo can run a 2.5" right from the ball and socket connection on
> back. You have to fiddle a it to get it right so the angles are correct,
> and die grind the center of the pipe smooth after welding. 
> -James
>
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
> Behalf Of mikitka
> Sent: August-04-11 6:33 AM
> To: vwdiesel at vwfans.com
> Subject: Re: [Vwdiesel] Caddy Exhaust
>
> Bill,
>
> I have read on another VW forum where several have just run straight 2.5"
> pipe back from the turbo and the sound was not loud at all. As for mpg and
> hp gains, you will see mpg and performance gains any time you open up the
> exhaust on a turbo diesel. I noticed it on my 91 jetta just by putting on a
> 2.5" downpipe and running 2.5" all the way back to a flowmaster muffler. 
> Very quiet in the car. 
>
> Nick
>
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
> Behalf Of William J Toensing
> Sent: August 03, 2011 7:37 AM
> To: VW Diesel Fans
> Subject: [Vwdiesel] Caddy Exhaust
>
> I think I raised this question before but I don't recall all the answers. 
> Has anyone tried putting a straight pipe on a VW turbodiesel & if so, what
> were the results? Any MPG improvement? Was it to noisy? I have heard that a
> turbo quiets the exhaust enough to make it legal. I had an Argosy Airstream
> motorhome powered by an Isuzu 6 cylinder turbodiesel. It had a Chevy
> motorhome chassis, Turbohydromatic 400 transmission, also a Gear Vendors 2
> speed over/under drive. The prior owner had installed a straight pipe. With
> that 26 foot Argosy I got as high as 17 MPG! Wish I still had it. My
> Mercedes 300SD is only averaging around 25 MPG. Around 17 years ago I had a
> Peugeot 604 turbodiesel with an automatic which was a real underpowered slug
> but otherwise was a nice luxury car. Its top speed was around 60 MPH & only
> got around 20 MPG. I never tried it but have wondered whether a partially
> plugged muffler could have caused the poor performance? I had a Peugeot 505
> TD with automatic, s
> ame engine which would top out around 80 MPH & averaged around 23 MPG in LA
> traffic, as I recall. 
> If you go the straight pipe route you could use a copper straight pipe from
> a hardware store if you don't have to do any bending. Should last forever. 
>
> Bill Toensing, Nevada City, CA
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