What is a riser?

And why I have I not heard of this before?

 

The only reason you get a code if you remove the cats is because all the rear o2's do is detect flow. To much flow = Cat problem. To little flow = Cat problem.

Since removing them will increase the flow, the "non foulers" pull the sensor out of the exhaust stream a bit, thus cutting the flow it senses.

 

Thank you! I will be running test pipes initially and then high flows. Hope I'm good

 

Or you can get a tune, from a person who knows how to make it work.

No CATS here and I pass MA inspection

 

Buying a custom dyno tune (and tuner) are not planned in the short term (this year). Here's to hoping I don't have engine lights

 

Guy thats local to me only charges $150, so it was kind of a no brainer.

 

Only 1 dyno in my state, he charges $300 I believe

 

I received the risers from Brenspeed today. But go figure! The "Check Engine Light" has not come back since Brenspeed walked me through the procedure of "reading and clearing DTC's" from my XCal2. I am going for inspection tomorrow for emissions only. Let's see what happens. And yes, they were only $19.99 for the pair.