Technical Tips > Pre 84

No cats

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77CVT:
Yes, a dual system will have a louder note & tone than a single.  But generally speaking it will also have more power.  I don't believe it costs THAT much more (unless it's stainless steel), after all it's only a 6' bit of pipe.

A H pipe should be positioned, from what I have heard, at the point where paint would stop peeling off it.  This is directly behind the xmember in my vette, which is where the H pipe is (about the only place for an auto 'vette).  The H pipe should also be of a lesser diameter than the primary pipes.  Mine sure sounds melllllooowwwwwww now. :D :D

IMHO, a 2.5 inch dual system is a minimum for a decent 350.  For power gains, see my thread in Pre 84 tech Tips. :D

Here is a link for Tech Articles.  There is an article on balance pipes but I'll be darned if I can find it now!  http://www.autospeed.com.au/show_free/S_technical/section.html

Set your 'vette FREE, and put in a decent exhaust system!

Cheers

Adam:

--- Quote ---From what I know a dual pipe system with a "x" style crossover is best. Than a H style crossover. It has somthing to do with having a constant flow rather than an eratic one due to the cylinders firing on opposing sides and into seperate pipes.
--- End quote ---


I guess that shows I'm getting old.  I totally forgot about x-pipes.  When I was learning about exhausts h-pipes were the done thing and x-pipes weren't really heard of also - doh!.  You are right though.  FWIW I have seen some x-pipes advertised that go from two 2.5" pipes into an "x" with a section of 3" - kinda defeats the purpose in my opinion - there are x-pipes around with a larger centre cross-section though which to my mind should? work better.


--- Quote ---Although Im not really interested in that smigin more power that a crossover can provide.
--- End quote ---
 Probably not worth the money when you consider the gain - especially if budget is a consideration.


--- Quote ---Hah, nevermind:)
--- End quote ---
Keeping things in perspective is probably a good idea. :)  I've paid more than I needed to in the past just to get that "little bit better" when it wasn't really needed for my application.

Brutus:

--- Quote ---
Set your 'vette FREE, and put in a decent exhaust system!

Cheers
--- End quote ---


Chris...I will as soon as I get the time to put my Hooker side exhaust and STS baffles on. Then we'll hear some music.:22

Adam:
It's an interesting topic.
I know somone with a Ford Bronco that was bought in 1985 new. Still ran Leaded and obviously no cat.

The RTA says that for cars imported that are over 15 years old, the car must meet the ADR's of the date of manufacture to be legal.

Fianally, what if the car was imported with a modification, ie no cat. and got approved?

A

Brutus:
For some reason commercial vehicles are/were exempt from some ADRs relating to cats, etc. but I have no idea why.
I had a 94 Rodeo that was never fitted with cats from the factory and it ran on ULP.

As for an imported vehicle that was previously modified when it was shipped here, I'd say the RTA would refer only to its OEM condition. Tho having said that I doubt that in most cases they would know what that condition would have been back then. For example....sidepipes on a Corvette.

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