[cor66vette]

No state inspections/emissions here in FL so I want to remove the worthless pos from the exhaust system. What are the pros and cons of having no cat? I have an idea myself, but I thought I would throw it out to the more tenured C3 guys and get experienced replies. Thanks for the advice.

 

[Lethal Tendencies]

I don't think there any cons

 

[[email protected]]

I agree, its just dead weight if you don t have emission testing..true duals would be even better........Oh ,and don t believe anyone who tells you that you need that backpressure for torque or some such thing... Its a myth, backpressure does not help an engine ...I ve even heard some say it will burn your valves, nonsense. if you burn a valve its because your mix is too lean, not because the hot exhaust is leaving too fast

 

[aquarian]

Go for it!! Then you can run true dual exhaust on that 75. Might want to readjust the carb for mixture and idle afterwards, check the plugs after a few hundred miles.

 

[cor66vette]

I've toyed with going the true dual exhaust route. I don't want to do too much to it money-wise, just want to clean it up, tweak it here and there, and drive it. Removing the cat is something I think about doing every once in a while. Thanks. :thumbsup3:

 

[Lethal Tendencies]

I have true duals on my '75 with magnaflow mufflers. Sounds pretty good

 

[cor66vette]

I have true duals on my '75 with magnaflow mufflers. Sounds pretty good

I'm sure it sounds great. If I may ask, what did the complete set-up cost? Did you do headers, also?

 

[Lethal Tendencies]

I do have headers. I actually bought the car with this setup. Not sure on the cost. But it should be fairly easy to price it out

 

[[email protected]]

I'm sure it sounds great. If I may ask, what did the complete set-up cost? Did you do headers, also?

you can save money by getting your hi-flow mufflers and letting you local Muffler shop make -up the pipes ..I bought two S.S.Ultra-Flo mufflers and my muffler guy made up the 2 1/2 inch pipes from headers to mufflers for $150

 

[7t9l82]

with a free breathing exhaust you will almost assuredly need to richen your carburetor a little. and yes the back pressure thing is b.s . also recurve your distributor you won't believe how well it will run, no really you won't believe it

 

[toobroketoretire]

Or you can make your own mufflers like I did......................

 

[cor66vette]

with a free breathing exhaust you will almost assuredly need to richen your carburetor a little. and yes the back pressure thing is b.s . also recurve your distributor you won't believe how well it will run, no really you won't believe it

I shouldn't have to re adjust anything if all I do is remove the cat, right? I want to do the true dual exhaust but will probably just take off the cat for now.

 

[[email protected]]

I shouldn't have to re adjust anything if all I do is remove the cat, right? I want to do the true dual exhaust but will probably just take off the cat for now.

right