MoVIC

im removing my catalytic converter mainly for better fuel efficiency, but will my exuast be louder and will i get a few more horses.

thanks

Bert

The cats don't really make much difference. The way they are made the exhaust flows very easily with a VERY slight restriction. The check engine light will be lit too.

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Bert

87_Crown_Vic

i would be cautious about removing the cats if you have inspections in your state. i would try to find duals for your car from a police car... that will improve it some on your mpg and also power

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my 1986 Grand Marquis LS... Rose...

MoVIC

i see, but ill do it anywayz becuase where i live, there not required. and i already have duals

thanks :)

SyracuseP71

The cats don't change how loud your exhaust is, the mufflers do.

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2005 Crown Victoria Police Interceptor

72mgm98

I am not sure which yr car you have, but removing the cats will increase sound... and h.p., maybe. If it is has a carb on it, it will work. If your fuel injected, you have a pesky computer and oxygen sensors. They have what is called "upstream" and "downstream" oxygen sensors. Basically means one before the cat (upstream), and one after the cat (downstream). If the "downstream" oxygen sensor monitors no changes from the "upstream" oxygen sensor, the computer MAY signal a 'check engine' light and RETARD engine performance. So, you'll get a bit more sound, however, the performance may suffer, that is if you do have that arrangement of oxygen sensors....???

MoVIC

i have a 2003 crown vic.

now im having second thoughts 72mgm scared me :p

garage is going to open in a few hours, its 5a.m now, ill ask him if hes sure about the whole thing, and if it goes wrong ill just put it back

thanks everyone =)

72mgm98

A 2003.. ok, you should have 4 cats on that car.. I cant recall, but if the o2 sensors are surrounding the 1st cat on each side (driver and passenger), then you should be able to remove the second cat, and that should help a bit...

Bert

The O2 sensors are behind the second cat too. The O2 sensors on the older Crown Vics were between the two cats.

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Bert

MoVIC

thanks gentlemen, ill keep that in mind, very helpful, im leaving now, ill let you know what happens.