I didn't use the caps.

 

Did you experience rattling at idle?

 

Yep, welded the caps on,No rattles at all.

I did try packing some steel wool between the disc, but could really tell the power loss at upper RPM, then took them out.

You could easily have two sets of by-pass pipes, one baffled for daily driving, another for track full power !! You can change the pipes in like 10min..

 

Sorry, no rattling at idle, but there is a slight buzz when letting off the gas and decelerating. Most noticeable when the windows are down at slow speed. I've been wondering if this might be resolved by having the inserts welded in as opposed to just sitting in the pipes.

 

Are you talking about the same buzz that's there when you just have the bypass pipes installed and are decelerating? Or is it a completely different buzz?

 

I didn’t notice it without the inserts. And just to clarify it’s not the nice burble when decelerating, this is just a buzz more noticeable at lower speeds. The attached video let’s you hear it.

 

Yea that sound is present with just the bypass pipes, just a little more pronounced. I think you're good without welding them.

 

So the big question is... what is the buzz from and can it be eliminated ? Probably bugs me more than anyone else because I notice everything that changes with the car.

 

I can't really tell, it doesn't sound bad but I am in a storefront with a festival going on outside lol. Could it be vibration or reverb from it being loud?

 

I'm going to be adding steel wool and the plugs on my setup. So i'll let you know if it does that once I have everything installed.

 

So I installed and tested a couple of different setups with the 3 disc inserts yesterday.

1. The first setup I welded the end caps and wrapped each insert in steel wool. I revved it up before taking a test drive and there was so much back pressure that the driver side bypass pipe almost came off. I tightened it up and went for a test drive. The sound was initially not bad, but once I got on it it sounded like a mix of a turbocharged car and a vw bettle. Kinda like a Jetsons space ship sound. It was significantly quieter and didn't drone, but the loss in power was huge. I went back to my shop, removed the welded end tips, steel wool and then I drove home with just the inserts.

2. The second setup was with just the 3 disc inserts. It sounded great, much better than without inserts especially when decelerating, but it was still loud and in cabin noise was still bad. I pass through an empty industrial area on my way home, no cars were around so I punched it. The loss of power was really bad. Once the revs got to like 5-6k is when it seemed like it would propel the car forward harder. It sounded great, but it had more bark than bite. Once I got home I decided I was going to try wrapping the steel wool back on and not putting the end tips. After my drive to work this morning I decided I'm going back to my Fisters.

Without the inserts the bypass pipes perform the best, but they are too loud for me now. I drove with them for 3 years and then switched them to Fisters once the California exhaust law came into play.

So today I'm going to reinstall my Fisters.

Have you guys noticed this loss in power? It's really bad at least for me.

 

Interesting. I don't feel like I've lost any power with the bypass/3 insert setup. But I suppose without putting it on a dyno, it's all subjective.

 

That's true, but I've done back to back tests and the difference is night and day for me. When a honda civic is keeping up with you something is wrong.

I have my fisters on and it's back to feeling the way it should.

 

There aren't any discs per se. There is just a perforated tube in the center when you remove the fiberglass. In the pics above, I have the steel wool I was using rolled down off the end.

So maybe I should try the Car Chemistry setup instead. Which product snugly fits the Beluga pipes? I see several options at https://www.carchemistry.com/cc-inserts/

 

I'll sell you my 3 discs (including steel wool) at a loss if you're interested, they will fit in your Beluga pipes. I paid $160 and they were on the car for about 60 miles. Make me a reasonable offer and they're yours. PM me