bought a 87 conv. with tons of probs.(fuel pump,8 inj.,coolant sensor,MAF sensor,IACV sensor,EGR value,TPS sensor).my guestion is there was a ton of carbon build-up in the intake i cleaned it as best i could,im thinking that the CAT.conv. are stopped up because it doesnt have that much power,can i gutt the CATS with out messing up the ECM.HELP PLEASE.

 

I have the same Vette conv't in blue; I took the cats off altogether and noticed an increase in power. It didn't affect the performance at all, it increased it.

mypetu39

 

You can take the cats off, only problems you will have will be if your city has emissions testing and you might set an EGR code. ECM looks at O2 voltage readings when commanding EGR. It watches for a voltage change based on exhaust readings calculated with some backpressure produced by cats. Also on an 87, EGR uses backpressure along with vacuum to open EGR valve. [8D]

 

I took a vacum cleaner and a tire tool adn busted those cats up. Good power and REALLY loud.

 

This is ONE of your cats. Yea all that from one you got two up front. Chop them off. Convert to true dual and have it WELDED NOT CLAMPED with some high performance mufflers NO FLOWMASTERS. They are not that free flowing as you think and have heavy drone.

[IMG]local://upfiles/3722/834802243BC24495A8E530CBC95F5841.jpg[/IMG]

 

with all of those problems you say you are having, it could be a lot of things causing a lack of power. maybe you could expand a bit and we can help you narrow it down.

 

ive replaced all of those parts(runs great)just think its down on horsepower a little bit.i may just leave them on and drive it a little more and wait and see.THANKS 4 THE INFO.