[urq] mufflers, exhaust, etc

Martin Pajak martin at quattro.ca
Wed Nov 7 08:09:25 PST 2007


On my 7A 4kq I used CAC Ur-q rear section and CQ middle that CAC has
available.  I just needed to extend the mid muffler to connect to original
downpipe and move the tailpipes to match the bumper (CAC since came out
with rear muffler that fits 4kq directly).  Sound is amazing.  Actually a
bit loud with N/A motor, but fit quality and price even if you consider
shipping is a no brainer.

Mike H has the same combo on his 4kq turbo and it sounds very nice IMHO.
Obviously not as loud as on the N/A motor, but very nice!


> Ben Swann
> Steve,
> I have the CAC rear and am nothing but pleased and get lots of wow
> comments.  This is
> brushed stainless and looks like jewelry on the car – shame all you can
> see is the tips.
> It is perhaps slightly larger than stock – 2.5” nominal, and not very
> restrictive,
> certainly no worse than OEM and probably a slight improvement.  It is very
> difficult to
> fab anything larger that will fit properly.  The portion that bends and
> goes over the
> rear shaft will not fit anything larger – it is tight already.
> Unless you are shooting for well over 350 HP then the CAC unit will be
> nice.
> I am using the Stebro center section  which is fine and incorporates a
> small
> muffler/resonator.  CAC didn’t have one at the time, but if they do and it
> is anywhere
> as nice as the rear section, then get it.   In addition, I am using a high
> flow cat from
> Summit Racing that I fabbed the ends using some pipe that fits over the
> ends of the cat
> and had the ends flared to use 3” flanges – perhaps a little smaller, I
> had to do a lot
> of running around and fit checking when I did this.  You need to find the
> correct
> sealing washer, as the stock one is way too small when you up the diameter
> like this
> The downpipe is rather massive and supports a larger cat inlet.   There is
> not a good
> selection of piping that is available between 2.5 and 3”, so this is
> always the trick
> when you deviate from stock.  The cat although having 2.5” ID end pipes
> has a core that
> is probably at least 5” and these are available in brushed stainless too.
> The sound of my exhaust with the CAC rear and stebro middle is very
> pleasing – nice
> burble wit the I5 note and never droning or resonant.  Again, I am nothing
> but pleased
> with it.
> Ben
> [Date: Tue, 6 Nov 2007 16:44:07 -0800 (PST)
> From: urq <urq at pacbell.net>
> Subject: [urq]  mufflers, exhaust, etc
> To: ury <urq at audifans.com>
> Message-ID: <795019.13995.qm at web82811.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
> I was talking to Al about going with the CAC replacement muffler on my
> car, but he said
> that the pipe diameter was smaller than factory ... I wonder if it makes
> that much
> difference.  Does anyone have the CAC unit who can report on the exhaust
> note with that
> setup?  I need the resonator replaced as well (in fact it is worse) so it
> would be good
> to know what you have amidships as well.  I'll need something that works
> with the cat
> ... or includes a high flow cat solution.  John welded my parts up to get
> the car to
> pass smog, but I've got to say the exhaust note isn't what I remember it
> ... and I'm
> sure it isn't all due to the MC engine swap.  I guess I'll be looking for
> a system that
> isn't too boomy on the freeway though ... I'd hate to lose my hearing on
> the way to
> UPG2008!  :-)
> BTW, I just got a call from the DMV, my car has had its record
> straightened out so that
> I don't have to pay the registration fees and penalties from the years it
> sat in the
> garage ... hopefully we'll be completely legal by the weekend!  I picked
> up all the
> remaining excess parts from John Brasil at lunch today ... I think my
> first project will
> be figuring out why the MC-2 fuel distributor/injector set up wasn't
> working.
> Steve B
> San Jose, CA (USA)
> ... and to ECB ... thanks for your note ... sorry I haven't gotten back to
> you yet, but
> I shall!]
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