[Farachyy]

So I just installed the MAD resonated single mid pipe which sounds great, but I noticed a rattle after the fact. Not sure if its coming from the valves or maybe one of the clamps.

Wondering if anybody ran into this before I start looking under the car.

https://www.youtube.com/shorts/Vi_2-8qMzgw

[M4nication]

Are you 100% the pipes aren't hitting the heat shield around the exhaust or the exhaust brace. I say this because I did it myself, and noticed it was rattling, went under the car, and noticed it was hitting both the heat shield AND the brace. Adjusted it a bit, and good to go.

You could also check the clamps too, just to be safe. If it's none of that, it could be your valves. I have the OEM muffler/axleback. With the MAD resonated midpipe and catless downpipes. My valves don't rattle at all. So I don't think it's that (unless you have an aftermarket axleback. Then I can't vouch for that)

[Farachyy]

Yea, I self installed as well. I’ll definitely check that out and its most probabaly one of those two as you noted.

Thanks for the reply.

[M4nication]

Originally Posted by Farachyy

Yea, I self installed as well. I’ll definitely check that out and its most probabaly one of those two as you noted.

Thanks for the reply.

Of course can, glad I can help. Let us know do you solve it!

One trick I tried that worked well. Put a ½ inch piece of wood between the midpipe and the brace, and then tighten brace. Then adjust the pipes as needed. Then tighten the pipe. That way you know it's being tightened without hitting the brace. It'll also help hold the pipe in place as it'll have pressure, so you can adjust it to make sure it's not hitting the walls/heat shield either.

Then once the exhaust is fully tightened and you know it's not hitting the walls, loosen the brace slightly, slide out the piece of wood, and retighten the brace. Make sure to tighten the pipe BEFORE removing the wood piece, or else they'll just slump down again. If you do it right, the pipes won't budge once the wood is removed, and you'll have about a ½ inch clearance from the pipe and brace!

[Fugazii]

Just reach out he's always on this forum no worries he won't be MAD at you.

[Info@mad-us.com]

Originally Posted by Fugazii

Just reach out he's always on this forum no worries he won't be MAD at you.

I hear a tiny bit of what sounds like a valve rattle when rpm drops. If you are hearing more of a knocking when driving there is a 99% chance it's touching the heat shield or lower brace and just needs to be adjusted.

Post some photos of the brace clearance if you can and I will take a look.

[Farachyy]

Originally Posted by Info@mad-us.com

I hear a tiny bit of what sounds like a valve rattle when rpm drops. If you are hearing more of a knocking when driving there is a 99% chance it's touching the heat shield or lower brace and just needs to be adjusted.

Post some photos of the brace clearance if you can and I will take a look.

I will when I get a chance. I don't think it's a brace clearance issue because I made sure to leave at least a 1/2" gap. I'm leaning more towards the valve rattle.

[Info@mad-us.com]

Originally Posted by Farachyy

I will when I get a chance. I don't think it's a brace clearance issue because I made sure to leave at least a 1/2" gap. I'm leaning more towards the valve rattle.

If it's the small vibration rattle when reving and the rpms are dropping its fairly common with a stock exhaust. If its happening with valves fully open then it may be another issue.

[Farachyy]

Originally Posted by Info@mad-us.com

If it's the small vibration rattle when reving and the rpms are dropping its fairly common with a stock exhaust. If its happening with valves fully open then it may be another issue.

So is there anyway to reduce that vibration/rattle with the stock valves?

[Info@mad-us.com]

Originally Posted by Farachyy

So is there anyway to reduce that vibration/rattle with the stock valves?

Car is brand new so likely they aren't worn or anything like that. You could try resetting the valves with a scan tool.

Just remember the valves are metal on metal so any tiny bit of play along with exhaust pressure can cause a tiny bit of rattle when the valves are in closed mode.

[CC M3C X]

My 2 cents on this. Sorry for the long reply but hoping this helps.
I had the MAD single mid installed on mine. The tech that installed it had me take a look at everything while it was still up on the lift. Everything looked good with proper clearance over the brace etc…
Between his place and my office I heard nothing (no rattling). 4-5 hours later I left my office and the dreaded rattling began. I called him and he said bring it back in and we will look everything over. I reached out to the folks at MAD and they suggested that it might have settled after the initial heat cycle and could now be touching the brace (ever so slightly). This was the case. The trick was to loosen all of the clamps on the midpipe, essentially press up on the midpipe at the brace section then start tightening everything up. The guy that did mine used one of these telescopic floor stands to hold it up while he tightened it up. Once this was done the rattle was gone. A few thousand miles since and I have not heard it once.

[Info@mad-us.com]

Originally Posted by CC M3C X

My 2 cents on this. Sorry for the long reply but hoping this helps.
I had the MAD single mid installed on mine. The tech that installed it had me take a look at everything while it was still up on the lift. Everything looked good with proper clearance over the brace etc…
Between his place and my office I heard nothing (no rattling). 4-5 hours later I left my office and the dreaded rattling began. I called him and he said bring it back in and we will look everything over. I reached out to the folks at MAD and they suggested that it might have settled after the initial heat cycle and could now be touching the brace (ever so slightly). This was the case. The trick was to loosen all of the clamps on the midpipe, essentially press up on the midpipe at the brace section then start tightening everything up. The guy that did mine used one of these telescopic floor stands to hold it up while he tightened it up. Once this was done the rattle was gone. A few thousand miles since and I have not heard it once.

This! Always set the midpipe a little higher than it should be.

[Info@mad-us.com]

Originally Posted by Idemo

This is also common because some of the braces are copy and paste and don’t take into account for exactly that to happen. Exactly happened with a valvetronic brace most of them barely have enough clearance.

Incorrect, we engineered our brace to provide ample space without hanging too low, ensuring it avoids bottoming out on speed bumps and other obstacles . This is key for customers who are lowered.

Our brace is also cut, bent and water jetted here in the USA.

[Mickey D]

Originally Posted by Farachyy

So is there anyway to reduce that vibration/rattle with the stock valves?

Were you able to get the issue resolved?

[Farachyy]

Originally Posted by Mickey D

Were you able to get the issue resolved?

I haven’t reallly looked at it again. But I think it’s what MAD had said about the valves having a little bit of rattle due to the extra exhaust flow

[dxu33]

Originally Posted by Info@mad-us.com

If it's the small vibration rattle when reving and the rpms are dropping its fairly common with a stock exhaust. If its happening with valves fully open then it may be another issue.

Hi Info@mad-us.com , mine is making this rattle sound as you mentioned, especially at low rpm with the valves closed. I'm waiting on a Valvtronic axle back in the mail, will that fix this issue? Thanks

[Info@mad-us.com]

Originally Posted by dxu33

Hi Info@mad-us.com , mine is making this rattle sound as you mentioned, especially at low rpm with the valves closed. I'm waiting on a Valvtronic axle back in the mail, will that fix this issue? Thanks

Other than trying to reset the flaps the only fix would be a valve controller to open the valves slightly. You won't know if the new muffler fixes the issue until its installed.

[Info@mad-us.com]

Originally Posted by Idemo

You replace or add tension to the motor locking pin

Yeah you can try bending the locking pin to add a bit of tension not sure if that will work though but in concept it sounds like it may.

If brand new I don't see it needing to be replaced.

[Mickey D]

So is the rattle only present at startup with valves fully closed Or does it happen regardless of the valves position?