Hey guys i just received a test race pipe from custom maxima.com for $110. I was wondering if any of you have tryed this pipe and if so what are your results. I have a stillen y-pipe with a greddy evo cat back exhaust. I was told by a few people that it will make me throw a check engine light. Your replys are appreciated.

 

I have a testpipe on my car. The gains are to be expected at top end like above 4k rpms. It will really benefit if you boosted like i will be next week again.

You will not throw a CEL light for sure on a 2k1 car. Cant since there is no O2 sensor after the or near the cat

On a 2k Fed Spec car there is a O2 sensor after the cat, on testpipes for these cars if you have an 18.5" pipe with an O2 sensor hole in it, you will be fine.

Dixit

 

Help me out here, Imotion Max. What makes a piece of straight pipe with two flanges welded to it worth $110.00 when I can go to my local muffler shop and have the same thing made for $25.00?

 

custommaxima would say something like...."well...it's got a built in resonator and it's made of high quality blah blah blah and our pipes
will not make your car sound like a loud ricer etc etc"

the guy needs to make some sort of profit and that would be the only reason why I suppose

 

I got my test pipe put in my 2k1 about 3 weeks ago.. No CEL. I have almost the same setup as you, Greddy evo cat-back, cattman y-pipe.. The thing I notice is a lil more on topend, and your exhaust gets louder. But since you got the one with a resonator you shouldn't have this prob.. I'm still na for now but I'm getting boosted next week. I'll let you know the real gains then

 

That's not good enough, acMAX. Replacing the catalytic convertor with a non-resonated test pipe shouldn't have any appreciable affect on noise levels. So purchasing a resonated test pipe is a waste of money. Still, when I consider what some people are willing to pay for straight-through mufflers, nothing should come as a surprise.

 

Interesting, how do You explain this???NO CEL...my A**


In order to measure catalyst efficiency, the OBD II converter is equipped with "pre-cat" and "post-cat" oxygen sensors. Since a catalytic converter is designed to convert, for example, hydrocarbons (HC) and oxygen (O2) into carbon dioxide (CO2), a major difference occurs between the amount of oxygen entering and the amount exiting the converter.
In order to establish a chemically correct air/fuel ratio, the PCM is also designed to "toggle" or switch between a rich and lean air/fuel mixture. The oxygen sensors mounted closest to the engine’s cylinder head may switch between .200 mv (lean) and .800 mv (rich). When the a/f ratio is switched lean, excess oxygen enters the converter to help complete the oxidization of exhaust pollutants.
Since the chemical reaction that takes place in the converter consumes most of the available oxygen, the post-cat oxygen sensor shouldn’t sense as much oxygen content in the exhaust stream as does the pre-cat sensor. Consequently, the post-cat sensor switches at a much slower rate than does the pre-cat sensor.
Remember that the post-cat switching rate is much more important than the actual number of millivolts generated. The post-cat sensor may "hover" at .750 mv, which indicates that most of the oxygen has been consumed in the oxidation process. The higher voltage, however, doesn’t indicate a lack of oxygen. Instead, it indicates that the exhaust stream has a high content of oxidized pollutants.
When the converter begins to fail, the switching rate of the post-cat sensor begins to mirror that of the pre-cat sensor. When the PCM "sees" the post-cat sensor switching frequency duplicating the pre-cat sensor frequency, it illuminates the malfunction indicator light (MIL) and stores one of several possible codes in the diagnostic memory, such as the P0420 mentioned above.

 

p.s. Imotion Max go to www.testpipe.com & pay less

 

i put on the test pipe about 3 weeks ago, i did notice top end speed increase, i also lost a slight bit of torque at the bottom end, im putting the cat back on until i get a full exhaust, because i rather have my torque so i can smoke people out the hole. btw b4 the test pipe i was averaging 350-370 miles from a full tank, now i get 315-330.