Recently, I have heard this very annoying and quite loud buzzing sound coming from the joint where the b-pipe and the "cat" connect, it sounds at about 3200 rpm, and only at this point does it sound. It only happens after the pipes have started to warm up. I contacted Comptech and they said that this was apparently a problem they have had with their b-pipes for this model, and warranty won't cover it since it has expired. This may sound trivial but it does get very annoying especially with such an exhaust as this, that is known to be one of the best. Anyway, this is for a '98 GSR coupe. I have the comptech Tig ss 4-2-1 header, stock cat, and I want to keep the comptech mendral bend and muffler, but Comptech wants $275.00 for a new b-pipe. I have been quite pleased with their products but I was just wondering if maybe I should consider another product to replace Comptech's b-pipe, one that maybe superior in quality and performance, i.e. Spoon, T1R, SMSP. Does anyone have any experience with these b-pipes? What are your thoughts? What would you do? Any, helpful advice would be appreciated.

 

Anyone?

 

Winston, can you provide a photo?

I installed all my exhaust components, and from what I remember about my cat/B-pipe connection:
- cat has a triangular plate welded to the output piping; my stock cat had three bolts attached, while my new cat had only three holes (which was a PITA; luckily I had three suitable bolts and nuts available)
- B-pipe has a matching triangular plate welded to the input piping, with three matching holes
- cat-back kit came with metal/cardboard-looking gasket
- I used copper hi-temp gasket maker

So I don't understand what is rattling? Is it something in the cat? Is it something in the B-pipe? Is it a nearby heat shield hitting the cat and/or B-pipe? Is it the bottom of your shifter hitting the B-pipe?

 

Comptech said that it is something inside of their b-pipe near the connecting point of the b-pipe and cat. They said that it "can't be fixed" thus I have to buy a new one.

 

In my case...the rattling developed into a full on leak. My b-pipe is cracked around the first resonator after the cat .

 

94CivicEX:

What did you do about the b-pipe, did you go with another comptech?