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View Full Version : Making a Dp or test pipe



a4rings
08-11-2005, 10:01 PM
Would it be a bad idea to have a mufler shop make me a dp or testpipe sice they are already going to be making the rest of the piping for the exhaust?

quickglx
08-11-2005, 10:10 PM
What kind of a bender do they use? Mandrel bends? Good welder on hand? Stainless? I'm interested in getting a really nice test pipe/downpipe peice fabricated for my car as well... I'd like to know where a good place is close to me

a4rings
08-11-2005, 10:31 PM
i dont really kow, i'll have to check , i'm assuming mandrel bends

angryswede
08-11-2005, 10:35 PM
they could probably do it, no problem, just make sure it's mandrel bent.

A4Rob
08-11-2005, 11:17 PM
I had that done. It is fine. Just make sure that they are using the same size flex joint as your piping

a4rings
08-12-2005, 12:11 AM
How much $ did it run u rob? Also did they make you a testpipe or a downpipe? I'm getting a little confused here, so the muffler shop could make something so i could keep my cat? also if i were to get 2.5 piping or the exhaust, should i get a 3" dp or 2.5". also this is all on a ko3. thanks

A4Rob
08-12-2005, 08:15 AM
I have 3" test pipe, 3" down pipe, then 3" all the way back with one glasspack. No muffler. I had it costom made for around $300.

Monchichi8
08-12-2005, 08:41 AM
Originally posted by A4Rob
I have 3" test pipe, 3" down pipe, then 3" all the way back with one glasspack. No muffler. I had it costom made for around $300.

What?..how loud is that shiet? Glasspack???

juju4uofa
08-12-2005, 10:52 AM
Someone explain to me why mandrel bent is a neccesity? I realize the inside of the pipe is completely smooth but I just find it hard to beleive it makes that much difference especially when you have 2.5-3.0" piping. I don't believe many shops mandrel bend and then ones that do are pricey.

AudiMan
08-12-2005, 02:15 PM
Originally posted by juju4uofa
Someone explain to me why mandrel bent is a neccesity? I realize the inside of the pipe is completely smooth but I just find it hard to beleive it makes that much difference especially when you have 2.5-3.0" piping. I don't believe many shops mandrel bend and then ones that do are pricey.

paypal me $50 and i'll send you my old fluid dynamics book...mandrel bend keeps the diameter the same throughout the bend which is very important for the air to flow out quicker w/ minimal turbulance

A4Rob
08-12-2005, 02:30 PM
Originally posted by Monchichi8
What?..how loud is that shiet? Glasspack???

It turns a few heads...[cool] Also shoots flames at night.[race]

SeanF
08-12-2005, 02:34 PM
is it the same for gasses as it is for fluids? gasses can be compressed and uncompressed far easier than fluids... i may be taking fluid dynamics a little to literally...

AB18
08-12-2005, 02:43 PM
I would def use mandrel bends on the testpipe and downpipe, the rest of the exhaust i doubt it matters much when they use 2.5 to 3.0.

AudiMan
08-12-2005, 03:48 PM
gases and liquids are both fluids because they FLOWWWWW, not to worry, its a common misconception. I aced both quaters of fluid dynamics, thats how i was able to build my own exhaust which gives me an additional 300+ awhp.