NOISE RESTRICTORS / POWER CONES

Flick, well done. this pic i allmost identical to my cones, the most critical section is the inner side ie; say you bore the 20 mm hole straight through inner to outer, what you must do to eleiviate the unwanted backpressure is to machine a progressive tapper to the inner side starting at 30mm and tapper down 35 degrees to meet the 20mm outer. by doing this will only assist in less power loss not noise volume.

Thanks for the details... I was semi confident they had an internal taper but wasn't real sure

if it looks like this and works im in, ill pm you, i need 1 bad

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as i mentioned before, these cones do work quite well. when you first fit one of these start the engine and let it idle then put the cone on the end of muffler by hand and you will straight away notice the noise level drop by atleast 50%. the total length of this cone should be atleast 70mm long.

How much are you selling them for? are you turning them out of alloy?

Thanks

Flick, i sell these cones for $40 which includes postage, as you may know there is a bit of time needed to machine this from aluminium bar stock.

Thanks... that's about what I expected...

hey i cant see any pictures i dont know weather its the computer or there not up there yet
but would you be able to send some pictures of it to lachie__@hotmail.com

and how long would they last
how do they stay in

the cones will outlast a muffler. they are machined from aluminium solid bar, they are a press in fit or you can also add a small lock screw for safety.