Muffler hardware: Porsche vs. McMaster?
#1
Weathergirl
Rennlist Member
Rennlist Member
Thread Starter
![Question](https://rennlist.com/forums/images/icons/icon5.gif)
I have a set of motorsound mufflers coming this week. I peeked under the rear bumper yesterday and every screw and nut I can see is very corroded, and the hex screws holding the tips on and muffler to the cat looked partially rounded out. So, rather than get stuck in my driveway after cutting out a rusted bolt, I want to have new hardware on hand.
Everything looks to be standard sizes, so I was going to use McMaster instead of paying $10 a bolt from the dealer or getting FedEx from CA.
Anyone done this? Any of the nuts and bolts that are unusual and Porsche specific? I'm assuming the locknuts are the distorting type. Stainless steel is best?
Thanks! -Jon
Everything looks to be standard sizes, so I was going to use McMaster instead of paying $10 a bolt from the dealer or getting FedEx from CA.
Anyone done this? Any of the nuts and bolts that are unusual and Porsche specific? I'm assuming the locknuts are the distorting type. Stainless steel is best?
Thanks! -Jon
#2
King of Cool
Rennlist Member
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I have a set of motorsound mufflers coming this week. I peeked under the rear bumper yesterday and every screw and nut I can see is very corroded, and the hex screws holding the tips on and muffler to the cat looked partially rounded out. So, rather than get stuck in my driveway after cutting out a rusted bolt, I want to have new hardware on hand.
Everything looks to be standard sizes, so I was going to use McMaster instead of paying $10 a bolt from the dealer or getting FedEx from CA.
Anyone done this? Any of the nuts and bolts that are unusual and Porsche specific? I'm assuming the locknuts are the distorting type. Stainless steel is best?
Thanks! -Jon
Everything looks to be standard sizes, so I was going to use McMaster instead of paying $10 a bolt from the dealer or getting FedEx from CA.
Anyone done this? Any of the nuts and bolts that are unusual and Porsche specific? I'm assuming the locknuts are the distorting type. Stainless steel is best?
Thanks! -Jon
#3
Weathergirl
Rennlist Member
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Looks like it needs the following:
Tips and cat:
M8 x 65 - 4
M8 x 17 x 3 washer - 8
M8 locking nut - 4
Straps:
AM8 x 50 - 2
VF M8 locking nut - 2
Heat shields:
M6 x 14 - 4
M6 nut lock - 4
So what are "AM8" and "VF M8"?
Also, the how-to on pcarworkshop.com says that Porsche switched from hex head screws to cheese head screws at some point. Any reason for one vs the other?
Tips and cat:
M8 x 65 - 4
M8 x 17 x 3 washer - 8
M8 locking nut - 4
Straps:
AM8 x 50 - 2
VF M8 locking nut - 2
Heat shields:
M6 x 14 - 4
M6 nut lock - 4
So what are "AM8" and "VF M8"?
Also, the how-to on pcarworkshop.com says that Porsche switched from hex head screws to cheese head screws at some point. Any reason for one vs the other?
#4
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Jon, I'm almost surprised you're asking such a basic question! Of course you can throw out the porsche bolts and replace them with non-porsche. I picked up some replacements at Home Depot; I even bought US sizes. Probably 3/8" bolts x 2.5" long. If you want stainless, you'll probably need to use a smaller outfit like www.boltdepot.com since McMaster usually just sells that stuff by the box. Considering the frequency at which I change exhaust stuff, I just used antiseize instead of bothering with stainless.
#5
Weathergirl
Rennlist Member
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Thanks for the link--boltdepot looks like a good source.
I know it's basic--certainly anything would work for the donut connectors--but when I see strange descriptions in the parts manual for parts I haven't seen with my own eyes, like for the strap hardware, I figure it's better to ask.
I know it's basic--certainly anything would work for the donut connectors--but when I see strange descriptions in the parts manual for parts I haven't seen with my own eyes, like for the strap hardware, I figure it's better to ask.
#6
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Yeah, IIRC, the strap nut is a little captive dohicky that you wont' be able to find outside of porsche. I thought it was integral to the strap but I'd have to confirm that tonight (I just removed mine for obvious reasons...).
Trending Topics
#8
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
The 'special' designation for the muffler strap bolts may acknowledge the allan head bolts used, vs std. hex. The former spins more easily in the crotch of the strap ....
#9
Weathergirl
Rennlist Member
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Ahh--here's where I got confused: my straps look neither like the parts diagram (which shows the bolt coming in from the top into some sort of square captive nut), nor like the photo on pcarworkshop here: http://www.pcarworkshop.com/index.ph...ng_the_Muffler
Mine:
Mine:
#11
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Ahh--here's where I got confused: my straps look neither like the parts diagram (which shows the bolt coming in from the top into some sort of square captive nut), nor like the photo on pcarworkshop here: http://www.pcarworkshop.com/index.ph...ng_the_Muffler
Mine:
Mine:
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
#14
Weathergirl
Rennlist Member
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Well, I always thought that reusing a locking nut decreases its holding power. And installing bolts head down is a great way to lose a bolt.
But I won't worry about it. If it's really borked, I'll drill it out and use a new locking nut on top.
But I won't worry about it. If it's really borked, I'll drill it out and use a new locking nut on top.
#15
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
If so, then they are upside down on my car - and were on the parts car too: if in doubt that this is correct, think of how much fun one would have cranking an allan socket from above inside the fender well
BTW, the 4-5 folds in the strap work as a constant tension spring on the bolt - can't see them backing out through vibration/heat cycles.
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)