[jimadvig]

Originally Posted by cmitchell17

How bad is your undercar noise and engine lugging noise when inside?

It really isn't bad at all.

[enzia35]

Think the thinness is detrimental in the long term?

[cmitchell17]

Originally Posted by enzia35

Think the thinness is detrimental in the long term?

I don't think so, I don't see how it would ever cause a crack or anything, I mean unless you ran over something since its exposed on the bottom.

I just can't stand the crappy beat up work truck/van exhaust noise when the engine is lugged and loaded, its makes your 40k+ "sports car" sound like a 1980s van with half a million miles on it.

[jimadvig]

Originally Posted by cmitchell17

I don't think so, I don't see how it would ever cause a crack or anything, I mean unless you ran over something since its exposed on the bottom.

I just can't stand the crappy beat up work truck/van exhaust noise when the engine is lugged and loaded, its makes your 40k+ "sports car" sound like a 1980s van with half a million miles on it.

After paying more attention to my exhaust lately I can hear exactly what you have been talking about. It almost sounds like the exhaust is leaking and I have welded most of the joints and the rest with vband clamps at the header to x-pipe and then one back where the axle back starts just so I can remove it in sections if needed. I think the thin exhaust tubing that is being used on these kits are to thin and making it sound horrible. I am about to just replace it all with either magnaflow or just regular piping from an exhaust shop. I thought when I had the vbands installed it would take care of my exhaust leaks. But it still sounds like they leak but I am pretty sure it is the resonance from the thin piping used in the kit. Any thoughts on the piping being so thin that it is causing a resonating sound through the exhaust?

[cmitchell17]

Originally Posted by jimadvig

After paying more attention to my exhaust lately I can hear exactly what you have been talking about. It almost sounds like the exhaust is leaking and I have welded most of the joints and the rest with vband clamps at the header to x-pipe and then one back where the axle back starts just so I can remove it in sections if needed. I think the thin exhaust tubing that is being used on these kits are to thin and making it sound horrible. I am about to just replace it all with either magnaflow or just regular piping from an exhaust shop. I thought when I had the vbands installed it would take care of my exhaust leaks. But it still sounds like they leak but I am pretty sure it is the resonance from the thin piping used in the kit. Any thoughts on the piping being so thin that it is causing a resonating sound through the exhaust?

I think the sound we hate is radiating from the outside surfaces of the headers and its worse at the collector, probably because that's where there is a spike in pressure where the exhaust pulses meet.

Get under the car when its idling, when its safety jacked up of course, and be careful not to burn yourself on the header. Listen to where the sound is coming from on the header and I will bet you will hear more noise radiating from the merge collector area. The factory headers have a cast section at the merges as well. I think we need to focus on these areas, the header collectors are also very close to the ground which amplifies some of the noise back.

I haven't ordered any header wrap because its so expensive and I am not convinced its going to do anything, but I think I am going to try some.

I did add the magnaflow x pipe muffler like some other members here had, it does in fact quiet it up and a lot more than I though. The ticking and noise from the headers is still there and more noticeable now.

[Aaron07]

Originally Posted by cmitchell17

I think the sound we hate is radiating from the outside surfaces of the headers and its worse at the collector, probably because that's where there is a spike in pressure where the exhaust pulses meet.

Get under the car when its idling, when its safety jacked up of course, and be careful not to burn yourself on the header. Listen to where the sound is coming from on the header and I will bet you will hear more noise radiating from the merge collector area. The factory headers have a cast section at the merges as well. I think we need to focus on these areas, the header collectors are also very close to the ground which amplifies some of the noise back.

I haven't ordered any header wrap because its so expensive and I am not convinced its going to do anything, but I think I am going to try some.

I did add the magnaflow x pipe muffler like some other members here had, it does in fact quiet it up and a lot more than I though. The ticking and noise from the headers is still there and more noticeable now.

Are you full Kooks headers back? I am kooks headers with high flow cats to stock exhaust and I don’t like the tone of the NPP. Seems too raspy and tinny sounding now. I’d like a deeper mellow tone. Which magnaflow x pipe? Is it the resonated one? Part #?

[jimadvig]

Originally Posted by cmitchell17

I think the sound we hate is radiating from the outside surfaces of the headers and its worse at the collector, probably because that's where there is a spike in pressure where the exhaust pulses meet.

Get under the car when its idling, when its safety jacked up of course, and be careful not to burn yourself on the header. Listen to where the sound is coming from on the header and I will bet you will hear more noise radiating from the merge collector area. The factory headers have a cast section at the merges as well. I think we need to focus on these areas, the header collectors are also very close to the ground which amplifies some of the noise back.

I haven't ordered any header wrap because its so expensive and I am not convinced its going to do anything, but I think I am going to try some.

I did add the magnaflow x pipe muffler like some other members here had, it does in fact quiet it up and a lot more than I though. The ticking and noise from the headers is still there and more noticeable now.

When I am in the car driving it seems to be more under the car around the midpipe area. I have the whole Speed Engineering long tubes and x/midpipe. My exhaust shop ended up cutting the x-pipe out and installing a magnaflow x in its place. They were having issues welding the vbands to it since I had to use copper RTV to try and seal them up. I am tempted to rip out the Speed Engineering piping and replace with standard exhaust tube from an exhaust shop. Just not sure if it will make a difference or not.

[cmitchell17]

Originally Posted by Aaron07

Are you full Kooks headers back? I am kooks headers with high flow cats to stock exhaust and I don’t like the tone of the NPP. Seems too raspy and tinny sounding now. I’d like a deeper mellow tone. Which magnaflow x pipe? Is it the resonated one? Part #?

It's magnaflow 12469:
https://www.summitracing.com/parts/m...+5ba2887e89302

It should fit nicely in the tunnel right in front on the driveshaft, if you need pictures I can get some. I cut the stock exhaust and put it in place.

I will warn you though, it will make it a lot quieter, enough to where you might not like it. I am still not satisfied with my sound, I think you have to sacrifice a lot with long tube headers. There is a lot of bad quality sounds the stock manifolds and exhaust dampens.

I think a alot of the problem comes from when timing is pulled during the shift and it brings out the raspy/crappy sound from the exhaust. The magnaflow will help quiet that sound down, but I still think I can detect a lot of it, but most other people probably wouldn't notice.

[cmitchell17]

Originally Posted by jimadvig

When I am in the car driving it seems to be more under the car around the midpipe area. I have the whole Speed Engineering long tubes and x/midpipe. My exhaust shop ended up cutting the x-pipe out and installing a magnaflow x in its place. They were having issues welding the vbands to it since I had to use copper RTV to try and seal them up. I am tempted to rip out the Speed Engineering piping and replace with standard exhaust tube from an exhaust shop. Just not sure if it will make a difference or not.

I don't think it would help, if you look at the stock exhaust pipe its about the same thickness, but the difference is the stock exhaust pipe and manifold is thickened in areas where the exhaust merges like at the collectors and x-pipe, the stock tubular fabricated headers also aren't that thick and I believe there isn't much difference between the steel the stock stuff is made with and the usual 304 aftermarket stainless stuff.

Either way, I hear you getting rid of the stock exhaust manifolds and especially cats too make the car sound like crap and like its broken.

[6spdhyperblue]

I think the borla 60608 is legit for “bad” sound mitigation. Don’t know how it compares to the magmaflow. It is more resonator than muffler tho

[cmitchell17]

Originally Posted by 6spdhyperblue

I think the borla 60608 is legit for “bad” sound mitigation. Don’t know how it compares to the magmaflow. It is more resonator than muffler tho

I had ordered the Borla at first then after seeing the Magnaflow and seeing that it was an x-pipe in itself and that it was $150 instead of $500, I went with the magnaflow.

Now I think I am regretting that decision and wishing I had put the Borla on. I guess I could still order the Borla just not sure how I would fit it on since I want to do it myself but I don't have a pipe bender and exhaust work is almost impossible to do, at least cleanly of course, without the right equipment.

[cmitchell17]

I've never used header wrap, is all of it about the same? I don't think its going to do much for sound, but I am more desperate for a solution.

[6spdhyperblue]

First timer on header wrap, I had ceramic dougs before. For a daily, maybe would go ceramic but remember them be louder

Dei Titanium wrap on 2” tsp


Had them in and out a few times you could say. Making sure the fit was 100% no touching and no chance of clearance issues at full flex

I really only wrapped the primaries up before the merge. The merge is where the dirt collects and didn’t want junk sitting there. Also felt it was more important holding the heat in the primary pipe just before it merged..they want you to start wrapping over all four pipes and create a cave concoction...not into it, i ordered more ties and took it as far down the primary as i could and tied it off similar to the top. So yeah kinda opposite your theory for attacking the sound there tho. Not sure on that but the sowing machine ting ting is very little

[cmitchell17]

Originally Posted by 6spdhyperblue

Dei Titanium wrap on 2” tsp


Had them in and out a few times you could say. Making sure them fit and no chance of clearance issues at full flex

You wrapped them before you put the headers on?

I really wish there was a company out there that made properly engineered headers that cared about sound quality and maintaining the stock sound suppression characteristics. I'm sure it would probably be way too much money for an aftermarket company to invest in tooling for anything cast.