Just swapped out my RPF Supercat for the BHR resonated and have a pretty bad exhaust leak.
Sounds like it is from the front. I did reuse the the front crush gasket but, it looked to be in good shape.
I noticed when comparing the midpipes side by side that the BHR is about half an inch shorter and the RPF Supercat has about a quarter inch ridge that extends out from the inside of the pipe on the front while the BHR is flush.
Anyone else have an exhaust leak with the BHR? Going to replace the front crush gasket today and see if that fixes it.

 

I bought a different crush gasket as well. It was shaped a little different than the one that BHR sent me. After a lot of asking around, the hissing noise is normal.

Also, did your donut gasket go on easily?

 

yep donut gasket fit fine and looked brand new

 

havent replaced the gasket yet
drove it again with my mechanic friend in the car
he insists that it's not an exhaust leak and I can just hear the supercharger better...
I now believe that he is an idiot

I got up under the car while it was idling but, couldnt feel any exhaust leaks around the midpipe
probably because it was only idling and you cant really hear the leak unless you are accelerating

 

check closely at exhaust hanger welds. I had one break on an AP midpipe a long time ago.

 

will do Chris
sounds like its more in the front though
I'll be sure to post up some results after replacing the front crush gasket
hopefully that will fix it...sure looks/feels tight

 

normally does sound like it is in the front.

 

is it an actual leak or are you just hearing a hissing noise. If hissing, that is normal.

 

The easier way to tell if you have an exhaust leak is when first starting the car from cold. Nothing has expanded yet from exhaust heat.

If it's an 'air' sound, then that is more on the normal side. At a certain load point you can hear the exhaust flow itself (not the tone, but the actual sound of a gaseous substance passing through the pipe). More load and it gets drowned out by the exhaust tone, less and it fades away.

 

Pearl is right. The twisting shape of the resonator causes that noise. I took mine off far too many times trying to hunt that sound.

Also, my one end is ovalized and the donut gasket has to be convinced to fit. It's sealed though. I have video proof the flames come pouring out of the back.

 

yea its a hissing noise but, only when accelerating
strange since the RPF Supercat and RB dual resonated never made that noise :
so this is a common issue with the BHR pipe? interesting...

 

Not quite "accelerating", since at higher speeds you can start hearing it under neutral throttle. I wouldn't call it an issue either, just a change in the noise it makes as part of how the resonator works.

When I actually had an exhaust leak at the front gasket for my BHR pipe, startup when cold would sound really deep and throaty hollow sounding, and quite loud. This would fade as the pipes warmed up and closed the gap quite a bit. If you do have an exhaust leak, your noise might be a bit different. But checking it when cold is the key to finding if you do have it. Pipe expansion under the heat will seal both ends better.

 

I have no such noise at idle from a cold start
the tone and sound level is about the same just the hissing noise when accelerating
I havent gotten up to high speeds really
that explains why I couldnt feel the leak under the car though
thanks guys

 

I like that I can hear it. I've found that for my engine, the best efficiency appears to be cruising at a load just shy of when that air noise is audible. I have no idea if it is just circumstantial or coincidental, or if the reason for when it appears is also tied directly to when the efficiency takes a dive.

 

could be
no doubt the noise is related to a disturbed airflow somehow
I'm surprised I havent heard of this before

 

I have seen posts by a couple of other initially confused BHR midpipe owners. A free bag of snakes with every pipe!

 

maybe it would have helped if I'd read the BHR midpipe thread

 

How did you get to 1200 posts without learning to search?

 

you must not know monchie?

 

 

As a tribute:

That's cool. Pipes are good.

 

bhr? cool
but I prefer TurboXS midpipes

 

you put a smiley face, anyways nice