- Location
- Western Massachusetts
I'm getting ready to order replacement secondary catalytic converters and came across something I was unfamiliar with.
Before anybody says "Just straight pipe it", don't. End of discussion.
I'm shopping around on RockAuto and I saw that each of the Walker brand rear cats they carry happen to have a $50 mail-in rebate on them as well. The Walker cats use their "air gap pipe", which is essentially one pipe sleeved inside of another, apparently for insulative purposes?
http://www.walkerexhaust.com/products/pipes-tubing/air-gap-pipe
Now, it seems to me as though eventually, the outer pipe is going to rust open and expose the inner pipe to the elements, with an added "bonus" of an outer pipe to hold on to dirt, sand, mud, snow, moisture, etc. and cause accelerated failure of one, or more-likely BOTH of the pipes. Makes sense, right? Then, to complicate matters, the double wall would make it difficult to clamp in a section of patch pipe to repair any holes...also make sense?
Does anybody have an experience in working with this "air gap pipe" double-walled exhaust pipe?
The $100 total mail-in rebate is mighty attractive, but if the air gap pipe is useless BS, then I'll just get the Eastern Industries catalytic converters for a few dollars less than the Walkers.
What would you do in this case? Keeping in mind:
1) Custom is not an option.
2) Straight pipe is not an option.
3) Cost is VERY important.
4) Straight pipe IS NOT AN OPTION.
Before anybody says "Just straight pipe it", don't. End of discussion.
I'm shopping around on RockAuto and I saw that each of the Walker brand rear cats they carry happen to have a $50 mail-in rebate on them as well. The Walker cats use their "air gap pipe", which is essentially one pipe sleeved inside of another, apparently for insulative purposes?
http://www.walkerexhaust.com/products/pipes-tubing/air-gap-pipe
Now, it seems to me as though eventually, the outer pipe is going to rust open and expose the inner pipe to the elements, with an added "bonus" of an outer pipe to hold on to dirt, sand, mud, snow, moisture, etc. and cause accelerated failure of one, or more-likely BOTH of the pipes. Makes sense, right? Then, to complicate matters, the double wall would make it difficult to clamp in a section of patch pipe to repair any holes...also make sense?
Does anybody have an experience in working with this "air gap pipe" double-walled exhaust pipe?
The $100 total mail-in rebate is mighty attractive, but if the air gap pipe is useless BS, then I'll just get the Eastern Industries catalytic converters for a few dollars less than the Walkers.
What would you do in this case? Keeping in mind:
1) Custom is not an option.
2) Straight pipe is not an option.
3) Cost is VERY important.
4) Straight pipe IS NOT AN OPTION.