[Cullen]

IN STOCK!
StreetUnit SUS304 Stainless Steel Test Pipe (Catless)
Application: MAZDASPEED 6
Part Number: SUMS6SSTP

The StreetUnit Catless Test Pipe replaces the second catalytic converter on your MAZDASPEED 6. The SU test pipe is constructed using 2.5" ID SUS 304 Stainless Steel Tubing and CNC machined flanges. This removes the severe air flow restriction that the stock cat inhibits onto your exhaust system. Removing this restriction will greatly improve the performance and power for your MS6. It is a direct bolt on replacement for the second catalytic converter and we include all necessary hardware and instructions to make this installation a breeze. The removal of the 2nd cat will NOT trigger any check engine lights! The test pipe will bolt right up to both the stock and aftermarket catback exhaust systems.

Why did we use 2.5" tubing? The volumetric flow rate of the exhaust gas at the exit of the stock down pipe will be kept constant using the 2.5" diameter tubing. Using 3" tubing rapidly creates unnecessary turbulence in the exhaust flow when changing from 2.5" to 3" back to 2.5" diameter of the pipe/flange.

Product Availible HERE!


PHOTOS 1 & 2 ARE OF THE STOCK CAT PIPE AND PHOTOS 3-6 ARE OF ACTUAL UNIT

[arctic_blue83]

Why did you guys end up making the diameter 2.5" instead of 3"? Would there be a significant difference in power between the 2 piping diameters? Also, have you guys dyno'd these to see actual power gains?

Sorry so many questions, put me on the list regardless, but if you can give me a couple answers that would be great

[StreetUnitMike]

Originally Posted by arctic_blue83

Why did you guys end up making the diameter 2.5" instead of 3"? Would there be a significant difference in power between the 2 piping diameters? Also, have you guys dyno'd these to see actual power gains?

Sorry so many questions, put me on the list regardless, but if you can give me a couple answers that would be great

Making the diameter 2.5" makes it an exact stock cat replacement.

The main reason why we went with 2.5" diameter instead of 3":

For a complete stock exhaust system...you can swap the cat right out...and replace it with the same sized pipe. All that a 3inch pipe would do is cause unneccessary turbulence when the air flow goes from 3" and back to 2.5". The customer will still be able to purchase a CPE Catback and it will bolt up just like it would if he still had the stock cat there.

Also, being 2.5" this allows the test pipe to use the stock gaskets effectively.

I understand the the CPE Catback is 3" and can come with a 3" flange instead of the 2.5. Most people are eager to say if the test pipe was 3" this would bring the larger diameter pipe closer to the turbo, and take away more restrictions that a 2.5" wouldn't. However, since this test pipe is straight piping, having it 3" isn't going to remove any restrictions that the 2.5" isn't already removing since the test pipe has no bends. The air flowing before the test pipe will flow at the same Volumetric rate as the air flowing through the test pipe itself regardless of it being 2.5 or 3 because its straight with no bends. There is nothing about the test pipe that is going to create any turbulence and thus create any restrictions at the 2.5" dia.

And so to answer your question on what the power difference between a 2.5" and 3" test pipe would be, is minimal, if anything the 3" pipe may even dyno less gains.

The main purpose of this peice is to easily eliminate the nasty restrictions of that cat.

Dyno results will be coming soon.

Feel free to ask me any questions you have.

[stl_ls1gto]

there is a bend in the pipe of the stock cat, and the other vendor that had a test pipe for the ms6 also had a bend in their test pipe. How is it that you dont have to have a bend, but it also bolts up to the stock exhaust - and lines up correctly? thanks

[StreetUnitMike]

Originally Posted by stl_ls1gto

there is a bend in the pipe of the stock cat, and the other vendor that had a test pipe for the ms6 also had a bend in their test pipe. How is it that you dont have to have a bend, but it also bolts up to the stock exhaust? thanks

The one flange is welded on at a slight angle, making up for the bend in the stock cat.

[mazdaspeed619]

count me in!!! i've been waiting for something like this...

[FakterX]

What about the dump pipe? That other link from Mazda6 forum won't work.

[Cullen]

http://www.streetunitforum.com/forumdisplay.php?f=5

[Trees]

add me to this list too

[Craigg]

Cullen,
Please add me to the list for the new test pipe when they become available! Thanks, Craigg

[wawa]

Originally Posted by Cullen

SUF Members recieve first notification of new product availablity and special pricing.

Estimated ready to ship in 2-4 weeks...

Stock cat pipe compared to straight test pipe...

PHOTOS ARE NOT OF FINISHED PRODUCT!!!

Finished Test pipe will be stainless steel 2.5" pipe and cold rolled steel 2.5" flanges. Will reuse the stock donut gasket and spring bolts. It will bolt up to stock and CPE exhausts...

1. Cullen
2. arctic_blue83
3. Wiggum
4. Mazdaspeed619
5. wawa
6.
7.
8.

count me in

[wawa]

Is there going to be a big sound difference? woudln't think so, but just curious

[Tengo]

no test pipes for proteges? :-((

[bigj884]

no need for testpipes...ur not turboed....makes no since to have them.

[Tengo]

wow. why wasnt i surprised to see a post like that from josh?

[bigj884]

i dont know....y werent you??

oh and SU does have Hardpipes for the Protege's.....just incase you didn't know.....sold sepertaely...or you can buy them with an Upgraded SMIC....

[Tengo]

who asked about hardpipes? not me.

[StreetUnitMike]

list updated.

[arctic_blue83]

Originally Posted by StreetUnitMike

Making the diameter 2.5" makes it an exact stock cat replacement.

The main reason why we went with 2.5" diameter instead of 3":

For a complete stock exhaust system...you can swap the cat right out...and replace it with the same sized pipe. All that a 3inch pipe would do is cause unneccessary turbulence when the air flow goes from 2.5" to 3" and back to 2.5". The customer will still be able to purchase a CPE Catback and it will bolt up just like it would if he still had the stock cat there.

I understand the the CPE Catback is 3" and can come with a 3" flange instead of the 2.5. Most people are eager to say if the test pipe was 3" this would bring the larger diameter pipe closer to the turbo, and take away more restrictions. However, since this test pipe is straight piping, having it 3" isn't going to remove any restrictions since the test pipe has no bends. The air flowing before the test pipe will flow at the same Volumetric rate as the air flowing through the test pipe itself regardless of it being 2.5 or 3 because its straight with no bends. There is nothing about the test pipe that is going to create any turbulence and thus create any restrictions at the 2.5" dia.

And so to answer your question on what the power difference between a 2.5" and 3" test pipe would be, is minimal, if anything the 3" pipe may even dyno less gains.

The main purpose of this peice is to easily eliminate the nasty restrictions of that cat.

Dyno results will be coming soon.

Feel free to ask me any questions you have.

Thanks for the quick response Mike

[Rawyzf]

Please add me to the list!

[sikanimator]

Add me to the list.

I was just at a shop a few weeks ago asking about having a test pipe made.

Thanks.

[Red_6]

I'm in for sure. Please add me to the list.

[schlot]

Can you put me down....based on that I understand the price is in the $100 range.

Schlot

[StreetUnitMike]

Originally Posted by schlot

Can you put me down....based on that I understand the price is in the $100 range.

Schlot

Added, yes the price will be right around $100 shipped.

[arctic_blue83]

I just had one more question, in case I decide to upgrade at a different time, would you guys consider making a "shorty" downpipe at a later date?

[StreetUnitMike]

Originally Posted by arctic_blue83

I just had one more question, in case I decide to upgrade at a different time, would you guys consider making a "shorty" downpipe at a later date?

Yeah we would consider it, but that wouldn't be done til many of the test pipes are on the market..

[Cullen]

Originally Posted by wawa

Is there going to be a big sound difference? woudln't think so, but just curious

big no, noticable yes. 15-25% increase in sound. I will get a vid clip shortly for you...

[Rawyzf]

Originally Posted by Cullen

big no, noticable yes. 15-25% increase in sound. I will get a vid clip shortly for you...

That would be cool, thanks Cullen!

[fgraziano]

Please put me on the list. any chance of making your own single pipe exhaust, a la CP-E?

[fgraziano]

Any chance you can bundle your pipe with the ATC CEL fix?