JCON

What is a riser?

And why I have I not heard of this before?

S197GT07

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.

JCON

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

S197GT07

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

No CATS here and I pass MA inspection

JCON

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

S197GT07

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

JCON

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

cboisits

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.