Muffler delete pipe = extreme temps at tailpipe??
 

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Weird indeed. It looks like your tip extends out even further than the stock tips, which would rule out the extra heat coming from exhaust gasses exiting the pipe.
What type of metal did you use? I wonder if it holds more heat than the stock exhaust's metal, or that used by typical aftermarket companies.

it's definitely hot. apparently this was after 120 seconds of axleback delete with no straightpipe

http://www.youtube.com/watch?v=B7IgB...ature=youtu.be

yeah, i guess it's not surprising to see higher temps from a simple straight pipe.

the stock muffler is basically a giant heatsink. larger surface area = heat is spread out more.

making the pipe longer (increase surface area) and aiming it downward might help in saving your bumper.

time to break out the header wrap?

that would just increase the temps even more because you're trapping the heat.

i'd just weld up some longer exhaust hangers.

Well you could insulate the tip from the bumper at least. It would look funny

Could be an aerodynamics thing. You're injecting exhaust gas into the wake of the car, so it's expected that it could come around and linger around the bumper. Removing the muffler interferes with the airflow under the car too, and that could be causing more heat to reach the bumper too.

Seems very unlikely that the heat is getting there via radiation off the pipe, so maybe try extending the pipe an inch or two, and attaching a piece of coroplast or something to the bottom as a temporary diffuser.

Try putting on an exhaust tip, they act as a heat shield.

wow seems like that high compression really affects EGTs... I would maybe use a larger diameter pipe and angle it down so the exhaust is flowing away from your bumper..

I have the Nameless exhaust delete installed. No problems so far.
I think it extends a bit further out than the one you made.

To apply Occums Razor on both points

The steel you're using might be radiating more heat than the stock pieces (and as mentioned, would be less of a heat sink with far less surface area, too)

For the paint;t your can of paint has either gone bad, or reacted in a way it normally wouldn't.


Thats just my theory.

Boy you'll be spitting some flames with this!

I have a feeling this has to do with pressure/flow. With the stock exhaust you have two outlets so the heat from your exhaust is spread out and you cut the exhaust flow in half. I don't know if you still have enough scrap but I would try a whole new tailpipe with a 2nd outlet on the other side like stock.

That's my guess at least. Toyota/Subaru spent all this time developing a lightweight car I would think they would have removed a 2nd exhaust if they could get away with it.

Higher compression should reduce EGT though...higher EGT means more heat energy going to waste.

looks good...not bad at all

some people are trying to think too hard in here lol


I have the berk muffler delete, I installed it while the car was hot, the stock exhaust at the muffler flange was hot enough to be painful, and I work with hot metal and have a decently high threshold for heat/pain.

the Berk piece is 304ss and turns the familiar brown/purple rather quickly (170miles) with spirited driving, not dissimilar from the stock piping at the muffler that was just starting to lose it's paint in flakes after 3200 miles (hard ones)

there is quite a large amount of heat in the exhaust of this car, far more than I have seen in previous vehicles, but it also isn't something I make a point of datalogging...

under car airflow, is it worse without the muffler? most likely yes,

is it trapping heat? decidedly not, but there is definitely less surface area for it to dissipate through, and less mass for a heatsink

limiting the radiating heat with a tip with some air flow around it isn't a bad idea.

keep in-mind that the stock muffler TIP is about the same diameter, not the piping, and you have all the exhaust heat on one side now... If it is a large concern just go baller status and put gold reflective foil around the cut out in the bumper to reflect the heat...or go getto and wrap just the tip in header wrap

How about a turn down pipe, so aims down vs straight out should help w/ heat.

Thanks for sharing !

Might sound like a dumb idea but how about welding a few small fins on the underside of the pipe to act as a heat sink?

Aerodynamics between cars is pretty different, and this car used the muffler to crudely guide airflow somewhat, which most cars don't (they just have a muffler sticking out under the car).

so has this done any damage to your bumper?

Since thread was created I have made it a point to check is there is any high heat being transferred to the bumper outlet from my Nameless exhaust delete pipe (painted black w/bbq paint). Whether 15min, 30min, or 1hr drive, I haven't noticed any real heat being transferred. Immediately after parking the car, I've placed my hand on the bumper out let just above the exhaust tip and it's always just barely warm. It maybe the pipe placement or you just need a bit longer pipe.

Best of luck to you!

If you're going to try to sound smart, get the name right. Occam's Razor.

well this happened running no muffler at all and no pipe at all. The heat these cars produce is wild! The rear bumper just melted!

[ame="http://www.youtube.com/watch?v=B7IgBEyxjKc&list=UUSkcckSwAhBcAzrUty-4L-Q&index=4&feature=plcp"]Muffler Delete Produces Shocking Results - YouTube[/ame]

[ame="http://www.youtube.com/watch?v=haeDkmpapzc&list=UUSkcckSwAhBcAzrUty-4L-Q&index=3&feature=plcp"]Muffler Delete Produces Shocking Results: Part 2 - YouTube[/ame]

Hey, make some allowances for lazy typing :)
Wasn't trying to sound smart, was just trying to reason out why its happening. If I was smart, I would know why it was happening, and instead of contemplating it on a forum, would probably be making money from said knowledge.

Sh*t... Melted bumper.... Thats a bit much.... Must get hot back there... Wonder if running deleted cat and resonator will increase temps?

The heat coming from the exhaust is for real. We've seen pictures of people melting their bumpers off when the muffler was deleted completely with no pipe to route the exhaust gasses away from the bumper. The muffler delete pipe is a great item to reduce weight, but for heavy race conditions, the delete is not fully supported so the pipe actually wobbles laterally. During CSG's testing at Streets of Willow, the exhaust melted the inside edge of the bumper very slightly. You can't see this visually so you have to use your fingers to feel the backside of the bumper. Will this present an issue? Probably not, but if your car bounces around and causes the pipe to dance around violently, you can potentially scar your perfect bumper very slightly (no visual problem). Perhaps the heat could have to do with the car running very lean due to Direct Injection?

I have about 800 miles on my Berk Delete pipe and I have seen no deformation or discoloration due to heat, but the 304SS tip is fully deep purple now.

Just an update.

The pipe location seems to change based on the heat in the exhaust so it may be a matter of adjusting (berk has adjustable locator on the exhaust hanger) the position of the pipe in the bumper cutout while the exhaust is hot (i installed mine while exhaust was already hot, yes it burned)

I shouldnt have to worry about the nameless delete that i just ordered melting my bumper then?


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considering the other guy with the nameless delete said his bumper was totally fine after repeated testing, I think you're good to go.

If some people are experiencing lateral shifting of the pipe, just get some stronger exhaust hangars. I know Nameless recommends them when they sell their parts to avoid some of these fitment issues.

Did not know there were stiffer exhaust hangers available. Since they are available, this should solve any issues with any muffler delete kit. :thumbsup:

Man that is that exact product I want to get for my car. Did you notice any power increase with that? Is the car super loud and annoying to drive? I'd love to throw that and a k&n filter on the car and call it good. I've just been looking all over for reviews of the product and if you could provide me any information that would be so helpful!

There is no HP to be gained here, it is for weight reduction more than anything with the added benefit of being able to hear the car just enough for matching RPM's on Down shift

i called up nameless and had two of these added to my order! http://shop.namelessperformance.com/exhaust-bushings/

Hmm...might look to upgrade the hangers for autocross.
Cheap insurance.

Sorry to bump an old-ish thread, but I noticed that no one commented on the paint. BBQ paint is designed to radiate heat outwards. You would put this on a radiator or intercooler, NOT on exhaust!

For that, you want header paint. Rust-o-leum and VHT make good products that are made to withstand up to 1500-2000 F. I painted up/down pipes with this stuff and it worked great. Or, as stated above, just wrap the tip (that's what she said). Personally, I like the gold foil on the bumper idea!

Also, for those in the San Diego area, Kartboy also makes nice polyurethane exhaust hangers (standard and XL). He's in Mirimar and also owns a BRZ, so he's making more bits for us.

Might as well chime in here in case anyone is scared to do a muffler delete...I installed the Berk delete pipe w/tip recently and have had ZERO heat related issues. I feel around the area after hard drives, feels fine.

Also reporting in. Had a muffler shop fabricate something similar. I put about 400miles on it on one day, including some runs at Deals Gap/ Tail of the Dragon. I checked the rear bumper each time and had no issues with it getting hot.

Nice! Look into getting a #20 torch, everything is smaller and lighter. Also run an #8 cup and turn your gas flow to close to 30cfh when you do stainless steel or steels. It'll produce better gas coverage and more pretty colors that people love.

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