MBRP 409 Stainless 3" Exhaust Install and Interior Audio Clip

[IconST]

For the OP or any one with a MBRP do your tips hang some what low ? Or close to the top of the bumper mine look low

 

[grnmachine02]

Mine do. Maybe not hang low, but kinda point downwards? I think it's a matter of getting everything aligned properly.

 

[IconST]

Mine do. Maybe not hang low, but kinda point downwards? I think it's a matter of getting everything aligned properly.

Yeah ima have to rack it up and play with it i guess

 

[BiigMe]

Did you guys torque everything down to a certain number? Or is it more of go tight then another half turn?

 

[BiigMe]

So uh...holy shit the noises this thing makes are intoxicating. I made sure it didn't rub against the mid brace, and I'm going to check everything in a few days to make sure it's all kosher

 

[grnmachine02]

Glad you got it on! How'd the tips treat you? Does yours also have the weird loud spot between 2-3k rpm?

 

[BiigMe]

Glad you got it on! How'd the tips treat you? Does yours also have the weird loud spot between 2-3k rpm?

The real bad part was the extension after the muffler, and just keeping that clear of the mid brace. I do have the loud spot but mines at like 3500 rpm with like 25% throttle. I was happy with how the tips looked last night...well see how I feel when I can see them in the daylight haha

 

[grnmachine02]

Yeah that extension piece can be a bitch. I might space the brace down with a washer just in case.

 

[BiigMe]

Yeah that extension piece can be a bitch. I might space the brace down with a washer just in case.

I actually have fairly good clearance with mine I found twisting it so it pushes up from the hanger, if that makes sense, mmgave it the clearance it needed

 

[grnmachine02]

Mine seemed to clear, but for peace of mind I still might space it.


glad it all worked out for you though!

 

[BiigMe]

Mine seemed to clear, but for peace of mind I still might space it.


glad it all worked out for you though!

Thanks man, and the washer aren't that bad of an idea. I'm going to try and do the diy symposer delete because I think that's why it is a bit loud from 2.5-3.5k rpm

 

[grnmachine02]

I'm gonna do that after work today as well. You going to use a dorman rubber plug from the parts store?

 

[BiigMe]

I'm gonna do that after work today as well. You going to use a dorman rubber plug from the parts store?

Exactly that, looks like it should be easy. Just pop the hose that connects the symposer to the charge pipe, plug it, put the hose back on

 

[grnmachine02]

Nice. I hope it helps, although seeing as it does it on deccel as well....I don't know. I need to delete the symposer either way though.

 

[BiigMe]

True, I don't find the decel nearly as bad as when it's accelerating though, if it doesn't help much I might get some sound insulating for the trunk from RAAM and then in sure it will be fine

 

[grnmachine02]

How'd the symposer delete turn out? I never got around to doing mine.

 

[BiigMe]

How'd the symposer delete turn out? I never got around to doing mine.

Super easy, would have taken like 20 min if I didn't mess up one of the hose clamps. It eliminated a lot of the drone. 10/10 would recommend if you have the MBRP.

 

[grnmachine02]

So I've been doing some science (I use that term very loosely)

First thing in the morning, exhaust is quiet (aside from high idle) So quiet in fact, that sometimes it sounds like the stock exhaust is back on. As the exhaust heats up, it gets louder and louder, then eventually begins to have that boomy drone. I wonder if the exhaust is heating up and expanding enough to contact something under the car?

I'll report back.


Edit:// I was wrong.

 

[BiigMe]

So I've been doing some science (I use that term very loosely)

First thing in the morning, exhaust is quiet (aside from high idle) So quiet in fact, that sometimes it sounds like the stock exhaust is back on. As the exhaust heats up, it gets louder and louder, then eventually begins to have that boomy drone. I wonder if the exhaust is heating up and expanding enough to contact something under the car?

I'll report back.


Edit:// I was wrong.

I was gonna say, doing some quick math with some numbers I found online, (5.5E-6 in/in/f for T409, Change in T= 250* [50*-300*] as a generous assumption) The OD would only expand to 3.004125in.

Drone for me is only really bad in 2nd when it hits overboost, now this is only a problem when commuting because when your on it you hear no drone, just that engine singing. I'm still not happy with how my pipes are so I'm going to adjust them again hopefully tonight, but making sure everything is straight seems to really help. Plus I've got about 500mi on mine so far and now that its a bit more broken it it seems to get better. That being said the tips have a fair amount of soot, so on the backfires I hear I think it actually is spitting fire....that makes all the downsides OK IMHO.

 

[grnmachine02]

I have to delete the symposer and see where that gets me. The boominess is starting to annoy me, and I'm already deaf in one ear.

Worst case scenario I have an old vibrant ultra quiet resonator from an old car build that I can weld in.