hp gain from TT dp vs. Stock dual dp

[amalventano@sc.rr.com (Allyn)]

while no doubt they could have made that downpipe better, upward steps in
exhaust path can actually help exhaust flow (acts as a check valve, aids in
blocking the exhaust pulses that have bounced off of the
cat/resonator/muffler).
Al

----- Original Message -----
From: "Curt" <76Rocco@earthlink.net>
To: "rhys" <sik8v@netscape.net>
Cc: "Scirocco List" <scirocco-l@scirocco.org>
Sent: Sunday, December 29, 2002 6:35 PM
Subject: Re: hp gain from TT dp vs. Stock dual dp


> Since your planning to use it with a cat I would avoid buying the TT DP as
> the build quality sucks! I bought one, wasn't happy with the workmanship
at
> the collector, I contacted TT and spoke w/ Darrell whom I sent pic's of
the
> product, he checked the remaining inventory and said that they were all
like
> that and agreed to take it back or have it fixed, all in all I was out
$9.00
> shipping and wasted my time on it, the pic's are located here:
> http://home.earthlink.net/~76rocco/TT%20Downpipe/TT%20Downpipe.JPG and
> another here:
> http://home.earthlink.net/~76rocco/TT%20Downpipe/TT%20Downpipe2.JPG I'll
let
> you decide whether or not it's a performance upgrade, in my opinion it
would
> require the collector to be cut off and reworked in order to achieve the
> optimum flow out the outlet! if you look close at the pic's you'll notice
a
> couple of things, one is after they used a cutoff saw they didn't even
> cleanup the edge around the pipe (no biggie though just file it down!)
> second problem was where the two pipes were joined! (big problem was when
> they joined the pipes together they took too much material off each pipe
> resulting in a smaller than ideal inside diameter as seen by the extra
> material (weld) around the interior wall in the collector (should be 2"
but
> as you can see it is closer to the 1 7/8" that the factory dual DP is!)
this
> could have been repaired by cutting the pipe further back where the two
join
> and replace the short section of pipe leading to the flange, I asked to
take
> the pipe to a local reputable exhaust shop and have that work done with TT
> picking up the tab since the pipe should have been constructed like that
in
> the first place, Darrell said he was willing to spend up to $20.00 to have
> pipe fixed and after taking pipe to exhaust shop there was no fixing it
for
> that amount so I returned it to TT, I only hope the attention to detail is
> better for their "Race Pipe" but then your left without a cat. Autotech
Dual
> DP for use with cat was better at the collector but required a little
finish
> work at manifold flange area, also the Autotech pipe comes setup for the
> 10mm studs for use with a euro manifold vs. 8mm for US so your left with
> either installing 10mm studs, using step studs (if you can find them?) or
> possibly using exhaust nuts that have "shoulder" on them if your using a
US
> spec manifold.  HTH
> ----- Original Message -----
> From: "rhys" <sik8v@netscape.net>
> To: "rocco list" <Scirocco-L@scirocco.org>
> Sent: Sunday, December 29, 2002 2:10 AM
> Subject: hp gain from TT dp vs. Stock dual dp
>
>
> > i know switching from the toiletbowl setup to a dual manifold/dp setup
> > gives a nice gain in power, but i was wondering how much of a difference
> > the TT downpipe (to cat) makes versus the stock dual dp?
> >
> > thanks
> >
> >
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