Rennolazine

Passenger rear in front of trunk.

Goes to front firewall

Disconnect that ****

This part stays and is connected to a bladder with vacuum input. Where my finger is its got a check valve looking thing.

Where symposer was connected. Top tube

This is the bladder that i think resonates. It comes off the air intake near the split

808c2s

So by removing that tubing, did you have to plug anything, and did it fix the "droning"?

Rennolazine

Removing the tube cut the intake resonance 40%. I want to go after the rest of it thats why i asked John to look into it
i had literally already put a sock in the firewall (from the cabin side)didnt plug anything else

808c2s

I see,,,did you plug it at the firewall end protruding into the cabin? Wouldn't that cut down the droning even more?

Rennolazine

yes that was the first thing i did.

808c2s

So, plugging the firewall end and removing the tubing only cut down ~40%?

Rennolazine

yep. But intake resonance is way more when you blow out the headers and put bmc

808c2s

Ah, I see....resonance was worse with the tubing intact and with headers + BMC.

Rennolazine

especially bmc.but only for certain exhaust combos

808c2s

Oh? What exhaust combos did you encounter?

Rennolazine

everything. So far i needed stock muffler to run bmc regardless of upstream components.

Soul Performance

You've got it Jim, that is indeed the plan. And I appreciate the understanding, as I appreciate you still wanting it to happen haha

They are in stock (as are most of our tips at the moment) for anyone that would like a set

Next car we have in we'll do some back to back testing on this and see what we can find. I'd prefer to maximize the potential drone first and see how much of a tangible benefit it offers in a worst case scenario, so I expect we'll end up doing it with a full system replacement. My buddy Brent used a vacuum plug he had laying around, I'd expect that would have less frequency penetration than a sock haha. That said, I have tried that myself with two pairs of socks up tailpipes of my Cayman R once to quiet down cold start in my neighborhood at 4am one time....didn't work when they blew 5ft across the parking lot

It was a pleasure chatting with you, and we wish you a quick install to go beat the snot out of it as soon as possible

Regards,
John Gaydos

Westcoast

Is this the howl that can be heard on decel or are we talking the drone under load between 1800-2800 RPM?

Numeric Racing

Mike is 100% correct I like it Loud and very Loud. All my cars have been but this one takes the cake. All I can tell you is it puts a smile on my face every time I drive it. I'm 50 but I feel more like I am 30. When I go under over passes or next to barrier walls I purposely drop it down a gear and let her scream. It's a GT4.It's not your mini van. As close to a race car you can get for the street. If I get drone I just simply drop it down a gear and goes away. I have no problem hearing my radio when I want to. I'd rather listen to this car scream. LOL. If you have any questions feel free to contact me anytime.

Daniel

MEM82

Here are some pics of the black dual wall tips! Picking it up tomorrow. Cannot wait!