New exhaust - what to buy?
 

Seems our cats are shot now (sparking/knocking sound from the underside when stepping on it and reduced power above 4000 rpm), and the front muffler has been welded, so we are considering a new exhaust system.

What are you guys recommending? Where to buy?

Does installing headers mean the engine needs to be pulled to get them on? (Someone told me so...)

The car is stock with 4:10 gears and Haibeck chip.

All tips and advice are welcomed [emoji106]Attachment 7946Attachment 7947Attachment 7948

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Re: New exhaust - what to buy?
 

Have enjoyed your photos. You cannot go wrong with Stainless Works headers with their high flow cats and a Corsa exhaust. Great sound at idle and when above 3000 RPM everybody knows you came to the party to play. No drone on the highway. Not the least expensive but worth the investment.

Re: New exhaust - what to buy?
 

yes, Corsa is nice.. But as stated it is really heard at WOT.. if it was not as loud as it is, I will still have it on my car.. I really liked the no drone aspect of it

Re: New exhaust - what to buy?
 

If the cats are coming apart internally, do not run the car! Fine bits of the ceramic will be drawn into the cylinders and will eat up the cylinder walls. If you research on this forum you can find much more on the catalyst issue. I believe AB26 has written considerably on this.


And, no the engine does not have to be removed to install headers.

H
:cheers:

Re: New exhaust - what to buy?
 

X2 for Corsa

Re: New exhaust - what to buy?
 

Should there be a warning lamp coming on if it's the cats..? I have no lamps on at all.

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Re: New exhaust - what to buy?
 

No warning lamp, your dealing with 1980’s technology. These cars only have one O2 sensor per side and it’s ahead of the cat. It can’t tell if the cat is bad. Later technology put O2’s on either side of the cat and could monitor cat function. But not on our cars.
H
:cheers:

Re: New exhaust - what to buy?
 

It looks as if you have aftermarket mufflers. If that's the case, I'd cut out the resonator and replace it with an X-pipe with the headers...Nothing wrong with the stock 2.75 exhaust tubing.

Re: New exhaust - what to buy?
 

It has Borla exhaust.

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Re: New exhaust - what to buy?
 

Here’s one of the threads by AB26 (Jerry Downey) in the subject of cat failure. Note that in the thread it’s confirmed by Mark Hibeck and even Graham Behan one of the original GM/Lotus engineers. It’s one of the reasons the later cat setup was changed on the 93-95 Cars.

http://www.zr1.net/forum/showthread....light=Catalyst
H