thegadget

As u guys may know, I have installed full 3" exhaust. After installation, I have lost close to 6mpg. I have been extremely easy on the throttle, and still getting 22mpg. Is this normal? Is there anyway to get better milage with the new exhaust without putting the oem back in?

fwynn

iTrader: (1)

well is ur 3" exhaust heavier than ur old one?

Luke_in_SD

22mpg is really good mpg

qksl2

You need a tune. Do you have a wideband?

Ian

Kruso

Definitely needs a tune, car is running rich possibly due to the lack of CAT. Do you have any kind of cats installed on your current exhaust?

Kruso

Slow_Sc3

iTrader: (1)

you lost mpg because the factory twins are spooling way sooner, go with a nice sized single turbo and your mpg will increase.

thegadget

I forgot to subscribe to this thread!! rats! Yeah, getting right at 22mpg. You are right slow_sc3, the turbos spool extremely fast. They spool barely over 2.5k now.

The new exhaust is lighter, quite a bit lighter actually. And I do have a Cat now. I put the high flow thunderbolt 3"-5"-3".

I do have a wideband, not installed yet. The bung is just waiting for me to stick the sensor in. I will see how rich it is running.

I still cannot believe I was getting 26+mpg before the exhaust! Man I miss that! I am just getting over 430 miles to a tank. Used to get over 500.

Thanks for your input. Just finished installing new spark plugs in my wife's 2001 mustang GT. What a mess!!! you have to pull the fuel rails!

Biggu

iTrader: (12)

well hey man if your not happy with it ill take donations and put it on my sc =)

thegadget

Thanks for the offer, but I will have to pass... lol