I have tried and once again failed with another attempt to fix the metal to metal clanking sound coming from the rear of the car. It has appeared out of the blue once we swapped my OEM shocks to a set of Bilsteins from a newer Miata. Since then I have greased the rear sway bar bushings. Replaced the rear sway bar end links. Replaced the bushings on the rear sway bar that I had greased before with OEM parts and still the noise persists. So after much research it was suggested that the exhaust hangers may be faulty. They are rubber and after 10 years of use I’m sure they would have lost some of their rigidity.
So I researched the ones to buy. OEM ones on eBay are nearly $20 bux apiece. There are two different kind and a total of five of them in use on our system. One on the pipe under the car, and four holding the exhaust manifold in place. Part # LF46-40-061 of which you use three of, goes under the car and on the back of the muffler closest to the rear of the car (tail pipes). Part # N3H2-40-061A are nearly twice the width of the other hangers and go on the front of the muffler closest to the differential.
But I was not going to spend $100+ bux on OEM hangers, they’re just cheap rubber, I don’t get why they cost so much. Even online part stores like Quirk or Tasca wanted over $10 apiece and something like $13 for the fat ones. No thanks!
The aftermarket hangers from Flyin’ Miata were $8-$9 apiece. The same ones on eBay could be had even cheaper from Kartboy and COBB with various offers for around $40 for a set of 5 with free shipping. But it still seemed excessive for what they really are.
So I started doing more research and found Advance Auto Parts sells Walker Insulators Part # 35119 for just $3 bux and with their generous 20%-30% discounts, it was just $11.55 with tax for the five I bought initially and $5.28 for two more that I bought to double up one of the muffler hangers to replicate the fat design of the OEM.
Everything looked so great, but after a test drive the noise is still there… Fuck me!
Here’s some pix:
A set of five from Advance Auto cost less than one OEM hanger!
The fat OEM hanger on the front of the muffler closest to the diff.
I used a lot of soapy water in a spray bottle to loosen the rubber, for whatever reason the 12mm holes on the OEM hangers were so loose that most of them just popped out with little effort.
new one on the right and old one on the left
the new hangers are 10mm so it took effort to put them on.
but with soapy water sprayed on both rubber and hangers it worked.
and then I had an idea to double up the rubber on the back hanger, it fit just right and introduced more rigidity I believe.
Although the brand name on Advance Auto web site and what I picked up in the store didn’t match, these seem to be good quality product, Made in India.
While inspecting the bottom of the car I noticed my X-brace was bent upwards in a place closest to where the exhaust pipe goes. So I took it off and straightened it out in a vice grip.
Oh how I wished this would have solved my clunky problem… it would have been so awesome especially how cheap the parts were compared to the new OEM end links and even OEM bushings. But fuck it didn’t work… the problem persists and it’s going to drive me crazy until I find the culprit!