I have 3 devices under my car connected to my exhaust, but I dont know what they are or what to do about them?

I have 3 devices under my car connected to the exhaust system. Im unsure about what they are, what I can do about them, or how I can modify these to make the car louder,lighter,and less restricted. The car is not broken and doesnt need repair, this is about modding it. My biggest concern is the last device (3rd picture), because it is big, and most likely heavy. I know the exhaust system will restrict the engine, I also know that the exhaust system has a muffler and a catalytic converter. So my question is   What is this device in the back? How can it be removed/bypassed/replaced/modified to be louder lighter and less restricting? And if I cant do anything with it, what can I do? (the devices are in order from closest to engine to farthest)

Question by fastcar123   |  last reply


does anyone know how to make a cheap train horn?

 I really want a LOUD horn. I got a face full of airbag this spring and I think a louder horn may have helped. and not only then either. a beep beep just dont convey the feelings I feel some times<:(

Question by Rahdzhillaxxx   |  last reply


Trying to make a black light mirror the magnitude of speakers Answered

Trying to make a black light mirror the magnitude of speakers, not just on or off if the sound is loud enough, I'm trying to make it get brighter and dimmer as the music gets louder and softer. Help please? I can't find anything online that would be variable, all I can find is guides for LEDs, which are much lower power than anything I'd like to use, and guides for modules that simply switch on or off like the clapper. Any advice or ideas would be greatly appreciated

Question by moses324   |  last reply


Strange Planet Part Two

Following along in the last post about the wild world of water, let's see what other natural oddities our Earth has for us. There's a strange sound coming from the ocean, they're calling it a "Bloop." The earth is known for whistling caves, and plopping mud puddles, thunder and earth quakes, so we know the earth is one vocal creature. But the bloop is new, and as of yet unknown. This is what we know: "Although the sound matches the profile of a living animal, it is much louder than any known creature can produce. Any creature that could produce such a sound would have to be many times larger than the largest whale."The story is here.What do you think it is?_BG\\via neatorama\\

Topic by lamedust   |  last reply


Ducted vacuum cleaner anyone?

My sister approached me today with the news that her vacuum cleaner went up in smoke.While cleaning out the old rental and with the aim to clean the new home during the next few days.This made me thinking about the the ducted vacuum system that were quite popular around here.Most modern house won't get something like that and for the older ones it means once they fail they stay dead.After all the tenant can buy a vacuum cleaner to clean the carpets...Anyways...I had a look around here and in other places to check on home made solutions of the more modern type.As my sister is allowed some DIY to improve the quite old house I was wondering about installing a ducted vacuum system.Of course there is not much out there, commercially, that would be up to our modern times.Far too noisy, lack of sucktion and despite all totally outdated filter systems that won't keep the turbine or motor clean.Some people however came up with quite clever ideas.For example building your own cyclonic shop vac.Another one I quite liked was was a home made housing for standard drum type shop vac.Apart from the air noise the thing was almost silent.No screaming motor, no outcoming air acting as a funnel for the noise create.The air going in and through the hose was louder then the actual vacuum cleaner LOLI would like to create something similar by salvaging a proper shop vac as a bas for the sucking part.But as it is an old house I would really like a wooden solution to entire housing and casing problem.Not just a screaming thing mounted to the outside of the house....Far less noisy than the donor, cyclonic (proper) seperator and easy to empty.Like place a bag under it and open the bottom easy.Something originally intended for inside use might be weatherproved or placed in a properly covered area if required.Any ideas for the wooden part apart from starting from scratch with 3D models?Anyone here done something similar and willing to provide some feedback on how well it all performs?

Topic by Downunder35m   |  last reply


That didn't just happen, did my oscilloscope die!?!? How??? Repairable????

I went to my workbench today to discover that my BK Precision 30MHz analog scope has stopped working. Symptoms: ❶  Still shows a trace ❷  The trace does draw across the screen*  ❸  The horizontal time base seems to work ❹  10x horizontal magnification seems to work ❻  XY mode only draws in the X direction ❼  Waveforms do not show up, for either chA or chB ❽  Triggering seems to work (it causes the trace to draw more/less frequently. No vertical deflection)  ❾   Vertical controls for both channels have stopped working ❿   Dual trace shows only one trace ⓫   I have not been able to do anything to make the trace move up and down, vertical deflection is definitely shot. ⓬   * When changing the timebase, I noticed that the length of the trace horizontally gets shorter, and when a signal is present, or the vertical position for the appropriate channel is twiddled, it becomes the right length, within certain ranges. ⓭    When I was reaching for a powerstrip to turn off power to the lab the previous night, I heard a loud buzz, similar to that of the degaussing on a old computer monitor, but louder. no sparks or anything were visible as I recall. scared the crap outta-me, and I could not figure out what had happened. First thought was that maybe somewhere there was a live mains exposed somewhere that had shorted to ground or neutral. That was quickly dismissed since nothing was exposed like that, and also it would have popped the circuit breaker, and instead would have sounded like a firecracker. This sounded more like a small transformer failing. Also the same day, I have been messing with a tesla coil circuit (my beefed up slayer exciter) and the probes were sitting here by not connected picking up interference. They were in 10X mode, I do not remember the volts per division, however. I do recall a trace being shown on the display the previous day. With these symptoms, I think the issue has to do with the vertical control on the CRT, and perhaps another, separate issue with the horizontal time base control, or possibly triggering. I think I might do a teardown on it to see if there is anything obvious that has failed, such as a charred coil. Then I will need to figure out what had caused the issue. It is obviously something gone horribly, horribly wrong with vertical deflection or something of the like. I will have a look at the schematic and see what I can learn about the operation of the scope. I am glad I do have the user manual and schematics, so it should be straightforward, it is a nearly 100% BJT design. The scope was used and old, and lacked a lot of features, such as cursors and frequincy counters. Perhaps it is time for a digital upgrade anyway... http://www.amazon.com/gp/product/B00N222I6C/ref=s9_simh_gw_p504_d15_i1?pf_rd_m=ATVPDKIKX0DER&pf;_rd_s=desktop-1&pf;_rd_r=1VEC8M45MB2T9REXCR7N&pf;_rd_t=36701&pf;_rd_p=2079475242&pf;_rd_i=desktop

Question by -max-   |  last reply