slater

how much are you looking for? (for the race cats?)

slater

high-flow cats that you could have welded in (or have bigger piping fabbed in). i'm looking to do this, as it is MUCH cheaper than bending over and paying $1200 for the milltek ones...ouch.

fyi, two universal carsound cats will be around $120.

peter

sTTanford

second O2 sensor monitors efficiency of cats, and triggers secondary air injection (the second tube that comes off your air filter box). first O2 sensor does all of the airfuel feedback (i cant confirm this, ive only been told this). that being said, i still felt like i ran a bit richer with the straightpipe, but i dont know whether that was a function of freer-breathing exhaust or the confused second O2 sensor.

anyway, you can run straight pipes, it will enhance low-end but harm top-end, ie make it torque-ier but slow to accelerate at high speeds. i ran that set up for a while (second O2 dangling in air), and i got CELs once a week or two. many people have looked into O2-blackboxes, which trick the sensor into reading normal levels. hopefully they'll chime in here.

boostedTT

Did you get that smaller GT30R on?

sTTanford

i put an 0.48 turbine housing on (0.63 prev), last april. that one? if so, yup!

boostedTT

You have AIM or similar?

EasTTcoasTT

As opposed to some other cars.

EasTTcoasTT

And theoretically they could be for sale... and they're basically brand new Milltek (VERY EXPENSIVE $1200) no CEL throwing race cats.